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Territorial evolution of Germany
Territorial evolution of Germany
from Wikipedia

Germany, 1871–1914

The territorial evolution of Germany in this article includes all changes in the modern territory of Germany from its unification making it a country on 1 January 1871 to the present, although the history of both "Germany" as a territorial polity concept and the history of the ethnic Germans are much longer and much more complex. Modern Germany was formed when the Kingdom of Prussia unified most of the German states, with the exception of multi-ethnic Austria (which was ruled by the German-speaking royal family of Habsburg and had significant German-speaking land), into the German Empire.[1] As a result of its loss in the First World War, the 1919 Treaty of Versailles stipulated that Germany cede about 13% of its territory to its neighbours; its colonies were lost at the same time.[2] The Weimar Republic was formed two days before the end of fighting in WWI. This republic included territories to the east of today's German borders.

The period of Nazi rule from the early 1930s through the end of the Second World War brought significant territorial losses for the country. Nazi Germany initially expanded the country's territory dramatically and conquered most of Europe, though not all areas were added to Germany officially. However, the Nazi plan for the near future was the establishment of a Greater Germanic Reich[3][4] including most of Europe. The Nazi regime eventually collapsed, and the four Allies occupied Germany.

Nazi annexations from the time of its annexation of Austria on 13 March 1938 were annulled while the former eastern territories of Germany before Nazi annexation of Austria were ceded to Poland and the Soviet Union and the Oder and Neisse Rivers became Germany's new eastern boundary. This territory became Poland's so-called "Recovered Territories", while approximately one-third of East Prussia became the Russian Federation's Kaliningrad Oblast. In the west, the Saar area (Saarland) formed one French-controlled protectorate with its own high autonomy.

The western part of Germany was unified as the Trizone, becoming the Federal Republic of Germany on 23 May 1949 ("West Germany"). Western-occupied West Berlin declared its accession to the Federal Republic of Germany in 1949 but was denied by the occupying powers. The Soviet zone of Germany in the east, including the Soviet sector of Berlin, became the communist German Democratic Republic ("East Germany") on 7 October of the same year.[1] on 1 January 1957, the Saar Protectorate (which was separated from Germany on 17 December 1947) became a part the Federal Republic of Germany,[5] as provided by its Grundgesetz (constitution) article no. 23 ("Little reunification"). East Germany, including East Berlin, became parts the Federal Republic of Germany on 3 October 1990 – an event referred to as German reunification.[1]

Background

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German settlement in Central and Eastern Europe

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Following the conquest of Prussia by the Teutonic knights in the Prussian Crusade, German settlers were brought in, displacing the indigenous Old Prussians.

Part of the motivation behind the territorial changes is based on historical events in the Eastern and Central Europe. Migrations to the East that took place over more than a millennium led to pockets of Germans living throughout Central and Eastern Europe as far east as Russia. The existence of these enclaves was sometimes used by German nationalists, such as the Nazis, to justify territorial claims.

The rise of European nationalism

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The territorial changes of Germany after World War II can be interpreted in the context of the evolution of global nationalism and European nationalism.

The latter half of the 19th century and the first half of the 20th century saw the rise of nationalism in Europe. Previously, a country consisted largely of whatever peoples lived on the land that was under the dominion of a particular ruler. As principalities and kingdoms grew through conquest and marriage, a ruler could wind up with many different ethnicities under his dominion.

The concept of nationalism was based on the idea of a "people" who shared a common bond through race, religion, language and culture. Furthermore, nationalism asserted that each "people" had a right to its own state. Thus, much of European history in the latter half of the 19th century and the first half of the 20th century can be understood as efforts to realign national boundaries with this concept of "one people, one state". Many interior conflicts were a result of more or less pressurising citizens of alternative ethnicities and/or other native languages to assimilate to the ethnicity dominant in the state. Switzerland was the exception, lacking a common native language.

Much conflict would arise when one nation asserted territorial rights to land outside its borders on the basis of an ethnic bond with the people living on the land. Another source of conflict arose when a group of people who constituted a minority in one nation would seek to secede from the nation either to form an independent nation or join another nation with whom they felt stronger ties. Yet another source of conflict was the desire of some nations to expel people from territory within its borders because people did not share a common bond with the majority of people of that nation.

History

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Formation of the German Empire

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Growth of Brandenburg-Prussia. During the Partitions of Poland between 1772 and 1795, Prussia annexed large swaths of the Polish–Lithuanian Commonwealth.
States of the German Empire 1871–1918 (Prussia shown in blue)

Prussia

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In 1701, the Kingdom of Prussia was established, which then expanded at the expense of the weakening neighboring powers. During the Great Northern War, in 1720, Prussia took a part of Swedish Pomerania with the city of Szczecin from Sweden.[6] During the Silesian Wars, Prussia annexed the bulk of Silesia from the Habsburg monarchy in 1742. During the Partitions of Poland between 1772 and 1795, Prussia seized 141,400 square kilometres (54,600 sq mi) of the Polish–Lithuanian Commonwealth's western territory, including the regions of Greater Poland, Gdańsk Pomerania, Kuyavia, Warmia, northern and western Mazovia, and the Duchy of Siewierz, including the Polish capital of Warsaw. Subsequently, renaming them as South Prussia, West Prussia, New East Prussia and New Silesia. After the annexation of the Polish territories, Frederick the Great immediately sent 57,475 German families to the newly conquered lands in order to solidify his new acquisitions,[7] and abolished the use of the Polish language.[8] During the Napoleonic Wars, Prussia lost control of parts of the annexed Polish territories, which became the short-lived Polish Duchy of Warsaw in 1807.

Following the Napoleonic Wars, Prussia annexed several territories per the Congress of Vienna, that is Rhineland and Saarlouis from France, the western part of the just dissolved Duchy of Warsaw with the Chełmno Land and most of Greater Poland and Kuyavia, Lower Lusatia from Saxony, and the remainder of Swedish Pomerania with Stralsund from Sweden.

North German Confederation

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The Prussian-led North German Confederation, founded in 1866, was combined with the southern states of Baden, Württemberg, Bavaria and Hesse and the formerly French newly merged Alsace–Lorraine to form the states and imperial territory of German Empire in 1871. In some areas of Prussia's eastern provinces, such as the Province of Posen, the majority of the population was Polish. Many Lorrainians were by native language French. Many Alsatians and Lorrainians of German language clung to France (see Député protestataire [fr]), despite their native languages.

Heligoland

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Britain ceded Heligoland to Germany in 1890 in accordance with the terms of the Heligoland–Zanzibar Treaty. The Heligolanders, then still prevailingly fluent in their Heligolandic dialect of North Frisian, adopted German citizenship, like many other Frisians of Germany along the North Sea coast.

World War I

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World War I Allied propaganda poster showing German expansionist ambitions

The only territory that Germany annexed during the First World War was the German-Belgian-Dutch condominium Neutral Moresnet. Since 1914, Germany occupied the territory, and on 27 June 1915, it was annexed as part of Prussia. The annexation never received international recognition (is not known whether the other Central Powers recognized the annexation).

Brest-Litovsk

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As part of the Treaty of Brest-Litovsk, Russia's new Bolshevik (communist) government renounced all claims to Finland, Estonia, Latvia, Lithuania, Poland, Belarus, and Ukraine.

Most of these territories were in effect ceded to the German Empire, intended to become economically dependent on and politically closely tied to that empire under different German kings and dukes.

Regarding the ceded territories, the treaty stated that "Germany and Austria-Hungary intend to determine the future fate of these territories in agreement with their population" with few other effects than the appointment of German rulers to the new thrones of Finland, Latvia, Lithuania, and Poland.

Territorial changes after World War I

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Treaty of Versailles

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Germany after Versailles
  Administered by the League of Nations
  Annexed or transferred to neighbouring countries by the treaty, or later via plebiscite and League of Nations action

The provisions of the Treaty of Versailles at the end of World War I obliged Germany to cede some territory to other countries. Besides the loss of the German colonial empire, the territories Germany lost were:

  • Alsace–Lorraine, which became a part of the German Empire following the Treaty of Frankfurt on 10 May 1871, returned to French sovereignty without a plebiscite as a precondition to armistice (i.e. and therefore not as a clause of the Treaty of Versailles) with effect from the date of the armistice (11 November 1918), (14,522 km2 or 5,607 sq mi, 1,815,000 inhabitants (1905)).
  • Northern Schleswig (including the German-dominated towns of Tondern, Apenrade, and Sonderburg) was given to Denmark after the Schleswig Plebiscite (3,984 km2 or 1,538 sq mi, 163,600 inhabitants (1920)).
  • Most of the Prussian provinces of Posen and West Prussia, which Prussia had annexed during the Partitions of Poland (1772–1795), were restored to the reborn country of Poland. Most of this territory had already been liberated by the local Polish population during the Greater Poland Uprising of 1918–1919 (53,800 km2 or 20,800 sq mi, 4,224,000 inhabitants (1931), including 510 km2 or 200 sq mi and 26,000 inhabitants from Upper Silesia). The remaining areas of both provinces were combined to become the new Prussian province of Grenzmark Posen-West Prussia. A sizeable German population still remained in the areas ceded to Poland, however.
  • The Hlučín Region of Upper Silesia to Czechoslovakia (316 or 333 km², 49,000 inhabitants).
  • East Upper Silesia to Poland (3,214 km2 or 1,241 sq mi out of 10,950 km2 or 4,230 sq mi – around 30% with 965,000 inhabitants), after the Upper Silesia plebiscite in which 60% had voted in favor of remaining German and 40% wanted all of Upper Silesia to become Polish. The vote was designed to provide guidance on how to divide the area, and most of the areas voting for Poland were separated from Germany.
  • The area of Eupen-Malmedy to Belgium, along with the Vennbahn railway line (which created six German enclaves within Belgian territory).
  • The northern part of East Prussia as Memelland under the control of France, Italy, Japan, and the United Kingdom, later transferred to Lithuania without a vote.
  • The area of Działdowo (a railway station on the Warsaw-Danzig route) in East Prussia to Poland (492 km2 or 190 sq mi).
  • An area from the eastern part of West Prussia and the southern part of East Prussia Warmia and Masuria, to Poland (see East Prussian plebiscite); the majority of the Slavic Masurians voted to remain part of Germany.
  • The Saar area was to be under the control of the League of Nations for 15 years, after which a vote between France and Germany would be held to decide which country it would belong to. During this time, the region's coal was given to France.
  • The port of Danzig (now Gdańsk, Poland) along the delta of the Vistula became the Free City of Danzig under the League of Nations. (1,893 km2 or 731 sq mi, 408,000 inhabitants (1929)), 90% Germans.

In Article 80 of the Treaty of Versailles, Germany acknowledged and promised to respect the independence of Austria.

Sudetenland

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The Sudeten Germans had attempted to prevent the German language border areas of former Austria-Hungary from becoming part of Czechoslovakia in 1918. Once part of Bohemia, they had proclaimed the German-Austrian province of Sudetenland in October 1918, voting instead to join the newly declared Republic of German Austria in November 1918. However, this had been forbidden by the victorious allied powers of the First World War (the Treaty of Saint-Germain) and by the Czechoslovak government, partly with force of arms in 1919. Many Sudeten Germans rejected an affiliation to Czechoslovakia, since they had been refused the right to self-determination promised by US president Woodrow Wilson in his Fourteen Points of January 1918.

Silesian uprisings

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The Silesian Uprisings (Polish: Powstania śląskie) were a series of three armed uprisings (1919–1921) of Poles in the Upper Silesia region against Weimar Republic in order to separate the region (where in some parts Poles constituted a majority) from Germany and join it with the Second Polish Republic.

Interbellum

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Territorial claims of German nationalists

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By World War I, there were isolated groups of Germans or so-called Schwaben as far southeast as the Bosphorus (Turkey), Georgia, and Azerbaijan. After the war, Germany's and Austria-Hungary's loss of territory and the rise of communism in the Soviet Union meant that more Germans than ever constituted sizable minorities in various countries.[clarification needed]

German nationalists used the existence of large German minorities in other countries as a basis for territorial claims. Many of the propaganda themes of the Nazi regime against Czechoslovakia and Poland claimed that the ethnic Germans (Volksdeutsche) in those territories were persecuted.

The Nazis negotiated a number of population transfers with Joseph Stalin and others with Benito Mussolini so that both Germany and the other country would increase their ethnic homogeneity. However, these population transfers were not sufficient to appease the demands of the Nazis. The Heim ins Reich rhetoric of the Nazis over the continued disjoint status of enclaves such as Danzig and East Prussia was an agitating factor in the politics leading up to World War II, and is considered by many to be among the major causes of Nazi aggressiveness and thus the war. Adolf Hitler used these issues as a pretext for waging wars of aggression against Czechoslovakia and Poland.

Rhineland

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On 7 March 1936, Hitler sent a small expeditionary force into the demilitarized Rhineland. This was a clear violation of the 1919 Treaty of Versailles which officially ended World War I. France and Britain were within their rights, via the Treaty, to oust the German forces. British public opinion blocked any use of military force, thus preventing French action, as they were internally divided and would not act without British support.

Saar region

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In 1933, a considerable number of anti-Nazi Germans fled to the Saar, as it was the only part of Germany left outside the Third Reich's control. As a result, anti-Nazi groups campaigned heavily for the Saarland to remain under control of League of Nations as long as Adolf Hitler ruled Germany. However, long-held sentiments against France remained entrenched, with very few sympathizing openly with France. When the 15-year-term was over, a plebiscite was held in the territory on 13 January 1935: 90.3% of those voting wished to join Germany.

On 17 January 1935, the territory's re-union with Germany was approved by the League Council. On 1 March, Nazi Germany took over the region and appointed Josef Bürckel as Reichskommissar für die Rückgliederung des Saarlandes, "Realm Commissioner for the re-union of Saarland".

As the new Gau was extended to the Rhine, including the historic Palatinate, the region's name was changed again on 8 April 1940 to Gau Saarpfalz (Saar-Palatinate). After the Battle of France, the French département of Moselle was incorporated in the Reichsgau.

Anschluss

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The Allies were, on paper, committed to upholding the terms of the Treaty of Versailles, which specifically prohibited the union of Germany and post-war Austria (a German-speaking country). This notwithstanding, the Anschluss was among the first major steps in the Austrian-born Adolf Hitler's long-desired creation of an empire including German-speaking lands and territories Germany had lost after World War I.

The events of 12 March 1938, marked the culmination of historical cross-national pressures to unify the German populations of Austria and Germany under one nation. However, the 1938 Anschluss, regardless of its popularity, was enacted by Germany. Earlier, Hitler's Germany had provided support for the Austrian National Socialist Party (Austrian Nazi Party) in its bid to seize power from Austria's Austrofascist leadership. Fully devoted to remaining independent but amidst growing pressures, the chancellor of Austria, Kurt Schuschnigg, tried to hold a plebiscite.

Although Schuschnigg expected Austria to vote in favour of maintaining autonomy, a well-planned coup d'état by the Austrian Nazi Party of Austria's state institutions in Vienna took place on 11 March, prior to the vote. With power quickly transferred over to Germany, the Wehrmacht troops entered Austria to enforce the Anschluss. The Nazis held a plebiscite within the following month, where they received 99.73% of the vote. No fighting ever took place and the strongest voices against the annexation, particularly Fascist Italy, France and the United Kingdom (parties to the Stresa Front), were powerless or, in the case of Italy, appeased.

Czechoslovakia

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The partition of Czechoslovakia from 1938 through 1939. German gains in purple (dark: Sudetenland, light: Protectorate of Bohemia and Moravia)
Sudetenland
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On 29 September 1938, Adolf Hitler, Neville Chamberlain, Benito Mussolini and Édouard Daladier signed the Munich Agreement. The Czechoslovak government capitulated on 30 September and reluctantly agreed to abide by the agreement. The settlement gave Germany the Sudetenland starting 10 October, and de facto control over the rest of Czechoslovakia as long as Hitler promised to go no further.

Hitler and Chamberlain signed an additional resolution determining to resolve all future disputes between Germany and the United Kingdom through peaceful means. This is often confused with the Four-Power Munich Agreement itself, not least because most photographs of Chamberlain's return show him waving the paper containing the resolution, not the Munich Agreement itself.

Without fortification which was built in Sudetenland, Czechoslovakia was now defenseless. On 5 October, Edvard Beneš resigned as President of Czechoslovakia, realising that the fall of Czechoslovakia was fait accompli. Following the outbreak of World War II, he would form a Czechoslovak government-in-exile in London.

Invasion of the rest of Czechoslovakia
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Germany in 1939 before the start of World War II

On 13 March 1939, Nazi armies entered Prague and proceeded to occupy the remainder of Bohemia and Moravia, which was transformed into a protectorate of the Reich. The eastern half of the country, Slovakia, became a separate pro-Nazi state, the Slovak Republic.

Prime Minister Chamberlain felt betrayed by the Nazi seizure of Czechoslovakia, realising his policy of appeasement towards Hitler had failed, and immediately began to mobilize the British Empire's armed forces on a war footing. France did the same. Though no immediate action followed, Hitler's move on Poland in September started World War II in Europe.

Memel Territory

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By late 1938, Lithuania had lost control over the situation in the Klaipėda Region. In the early hours of 23 March 1939, after a political ultimatum had made a Lithuanian delegation travel to Berlin, the Lithuanian Minister of Foreign Affairs Juozas Urbšys and his German counterpart Joachim von Ribbentrop signed the Treaty of the Cession of the Memel Territory to Germany in exchange for a Lithuanian Free Zone in the port of Memel, using the facilities erected in previous years.

World War II

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The Third Reich at its greatest extent (dark blue), 1942
Territorial expansion of Germany proper from 1933 to 1941 as explained to Wehrmacht soldiers, a Nazi era map in German

Poland

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After invading Poland in 1939, Germany annexed the lands it was forced to give to a reformed Poland in 1919–1922 by the Treaty of Versailles, including the so-called "Polish Corridor", the former Province of Posen, and East Upper Silesia. The Volkstag of the Free City of Danzig voted to become a part of Germany again, although Poles and Jews were deprived of their voting rights and all non-Nazi political parties were banned. Parts of Poland that had not been part of Wilhelmine Germany were also incorporated into the Reich.

Map of NS administrative division in 1944

Two decrees by Adolf Hitler (8 October and 12 October 1939) provided for the division of the annexed areas of Poland into the following administrative units:

These territories had an area of 94,000 km2 (36,000 sq mi) and a population of 10,000,000 people. The remainder of the Polish territory was annexed by the Soviet Union (c. 52%; see Molotov–Ribbentrop Pact) or made into the German-controlled General Government occupation zone.

After the German attack on the Soviet Union in June 1941, the Białystok Voivodeship, which included the Białystok, Bielsk Podlaski, Grajewo, Łomża, Sokółka, Volkovysk, and Grodno Counties, was "attached to" (not incorporated into) East Prussia, while East Galicia was added to the General Government.

Alsace-Lorraine

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After the invasion of France in 1940, Germany annexed the départements of Bas-Rhin, Haut-Rhin, and Moselle (Alsace-Lorraine). The German government never negotiated or declared a formal annexation, however, in order to preserve the possibility of an agreement with the West.[citation needed]

Eupen and Malmedy

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See Eupen-Malmedy

Luxembourg

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Luxembourg was invaded and occupied by German Forces on 10 May 1940. It was formally annexed to Germany in August 1942.

Parts of Yugoslavia

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From: History of Slovenia "After Yugoslavia fell, Germany, Italy, and Hungary each annexed parts of Slovenia, the largest part being Lower Styria which was annexed to the "Ostmark" (Nazi German Austria)."

South Tyrol

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South Tyrol was de facto annexed by Nazi Germany; it was part of the Italian Social Republic, a German puppet state at the time.

Recognition

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The fact there were the areas that had been incorporated into Nazi Germany since the Anschluss were repudiated in the Berlin Declaration of 5 June 1945 by the four victorious Allies who also officially abolished Nazi Germany and started to represent post-war Germany with the Declaration, new Nazi areas since the Anschluss were already considered the "annexations" by the Allies before in the war and were therefore non-issues in the post-war Germany.

Territorial changes after the German defeat in World War II

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With the Allied Berlin Declaration of 6 June 1945 and Potsdam Agreement of 2 August 1945, German annexations which began with the German annexation of Austria were annulled and Germany also lost the traditionally ethnic German eastern region[9] prior to the German annexation of Austria. Saarland separated from Allied occupied Germany to become a country under French protection on 17 December 1947, in 1949 the Federal Republic of Germany (FRG) and later the German Democratic Republic (GDR) were born, leading to Germany being split into two countries; present-day German territories were formed when the Saarland became part of the FRG on 1 January 1957 and the territories of the GDR became part of the FRG on 3 October 1990 (German borders also had other changes but tiny).

Allied occupation zones in Germany, 17 December 1947

As it became evident that the Allies were going to defeat Nazi Germany decisively, the question arose as to how to redraw the borders of Central and Eastern European countries after the war. In the context of those decisions, the problem arose of what to do about ethnic minorities within the redrawn borders. The territorial changes at the end of World War II were part of negotiated agreements between the victorious Allies to redraw national borders and arrange for deportation of all Germans that were east of the Oder–Neisse line. The Allies occupied Germany, but the Western allies and Soviet Union formed separate governments covering specific parts of Germany (West Germany and East Germany). The two Germanies reunified in 1990.

The Yalta Conference

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The final decision to move Poland's boundary westward was made by the US, Britain and the Soviets at the Yalta Conference, shortly before the end of the war. The precise location of the border was left open; the western Allies also accepted in general the principle of the Oder River as the future western border of Poland and of population transfer as the way to prevent future border disputes. The open question was whether the border should follow the eastern or western Neisse rivers, and whether Stettin, the traditional seaport of Berlin, should remain German or be included in Poland.

Originally, Germany was to retain Stettin while the Poles were to annex East Prussia with Königsberg.[10] Eventually, however, Stalin decided that he wanted Königsberg as a year-round warm water port for the Soviet Navy and argued that the Poles should receive Stettin instead. The wartime Polish government-in-exile had little to say in these decisions.[10]

Key points of the meeting that are relevant to the territorial changes of Germany are as follows:

  • There was an agreement that the priority would be the unconditional surrender of Nazi Germany. After the war, Germany would be split into four occupied zones, with a quadripartite occupation of Berlin as well, prior to unification of Germany.
  • Stalin agreed to let France have the fourth occupation zone in Germany and Austria, carved out from the British and American zones. France would also be granted a seat in the Allied Control Council.
  • Germany would undergo demilitarization and denazification.
  • The status of Poland was discussed, but was complicated by the fact that Poland was at this time under the control of the Red Army. It was agreed to reorganize the Provisionary Polish Government that had been set up by the Red Army through the inclusion of other groups such as the Polish Provisional Government of National Unity and to have democratic elections. This effectively excluded the Polish government-in-exile that had evacuated in 1939.
  • The Polish eastern border would follow the Curzon Line, and Poland would receive substantial territorial compensation in the west from Germany, although the exact border was to be determined at a later time.
  • A "Committee on Dismemberment of Germany" was to be set up. The purpose was to decide whether Germany was to be divided into several nations, and if so, what borders and inter-relationships the new German states were to have.

The Potsdam Conference

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At the Potsdam Conference the United States, the United Kingdom, and the Soviet Union placed the German territories within the 1937 Nazi Germany borders east of the Oder–Neisse line (before Austria became part of Nazi Germany ie an "annexation" on 13 March 1938) like in the Berlin Declaration of 5 June 1945 officially abolishing Nazi Germany before, and with the exception of parts of East Prussia, as formally under Polish administrative control. These were referred to by the Polish communist government as the "Western Territories" or "Regained Territories", as all these territories were under Polish rule in the past. It was anticipated that a final peace treaty would follow shortly and either confirm this border or determine whatever alterations might be agreed upon. Northern East Prussia and Memelland were placed under Soviet administrative control. The 1919 Versailles Treaty created Free City of Danzig was also placed under Polish administration. The German population east of the Oder–Neisse line disappeared from their traditional territories when they fled due to war then they were forcibly expelled.

At the end of the conference, the Three Heads of Government agreed on the following actions:

The Oder–Neisse line
Finalization of the Polish-German border
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Federal Republic of Germany (blue and yellow), German Democratic Republic (red), and the Saarland (purple), 7 October 1949

The problem with the status of these territories was that the concluding document of the Potsdam Conference in 1945 was not a legally binding treaty, but a memorandum between the USSR, the US and the UK. It regulated the issue of the eastern German border, which was to be the Oder–Neisse line, but the final article of the memorandum said that the final decisions concerning Germany were to be subject to a separate peace treaty.

Based upon this interpretation of the Potsdam Agreement, the CDU controlled German government maintained that the Oder–Neisse line was completely unacceptable and subject to negotiation. Also the Social Democrats of the SPD initially refused to accept the Oder–Neisse line. Thus, the official German government position on the status of areas vacated by settled German communities east of the Oder–Neisse rivers was that the areas were "temporarily under Polish (or [Soviet]) administration."

Between 1970 and 1990, the West German political establishment gradually recognised the "facts on the ground" and accepted clauses in the Treaty on the Final Settlement, whereby Germany renounced all claims to territory east of the Oder–Neisse line. In the Treaty of Warsaw (1970; ratified in 1972) West Germany recognized the Oder–Neisse line as Poland's western border and renounced any present and future territorial claims; this was reaffirmed by both German states in the 1990 Treaty on the Final Settlement with Respect to Germany as a pre-condition for re-union. The treaty was ratified in 1991 by the united Germany. United Germany and Poland then finally settled the issue of the Oder–Neisse border by the German–Polish Border Treaty in November 1990. This ended the legal limbo which meant that for 45 years, people on both sides of the border could not be sure whether the status quo reached in 1945 might be changed at some future date.

Luxembourg

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Belgium

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The "Working Party on Provisional Adjustments to the Western Frontiers of Germany" approved in 1949 the provisional transfer of 20 km2 (7.7 sq mi) containing 500 inhabitants to Belgium:[12]

  1. Bildchen (returned in 1956)
  2. Lichtenbusch (returned in 1956)
  3. Fringshaus — roads between Roetgen and Fringshaus, Fringshaus and Lammersdorf, Fringshaus and Konzen (first two returned in 1956)
  4. Leykoul (eastern part returned in 1956)
  5. Elsenborn
  6. Losheim (only the village returned in 1956)
  7. Hemmeres (returned in 1956)

As part of the 1956 treaty, in exchange for the territory ceded by Germany, Belgium ceded to Germany its territory north of the Fringshaus roads and bounded by the Vennbahn. The detached territory, in 1956 containing 704 inhabitants including refugees, was, prior to its 1956 dissolution and partition between West Germany and Belgium, ruled as an independent territory by Belgian Army Major General Paul Bolle, who enjoyed dictatorial powers.[13]

Netherlands

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Despite the more extensive annexation proposals of the Bakker-Schut Plan, only a few border modifications were implemented. On 23 April 1949, Dutch troops occupied an area of 69 km2 (27 sq mi), the largest parts of which were Elten (near Emmerich am Rhein) and Selfkant. Many other small border changes were executed, mostly in the vicinity of Arnhem and Dinxperlo. At that time, these areas were inhabited by a total of almost 10,000 people.

Starting in March 1957, West Germany negotiated with the Netherlands for the return of these areas. The negotiations led to an agreement (German: Vertrag vom 8. April 1960 zwischen der Bundesrepublik Deutschland und dem Königreich der Niederlande zur Regelung von Grenzfragen und anderen zwischen beiden Ländern bestehenden Problemen; short: Ausgleichsvertrag, i.e. treaty of settlement[14]) made in The Hague on 8 April 1960, in which Germany agreed to pay DEM 280 million for the return of Elten, Selfkant, and Suderwick, as Wiedergutmachung.

The territory was returned to Germany on 1 August 1963, except for one small hill (about 3 km2, 1.2 sq mi) near Wyler village, called Duivelsberg/Wylerberg which was annexed by the Netherlands.

France

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Starting on 16 February 1946 France de facto disentangled the Saar area and the separate Saar Protectorate of France was established when its constitution came into force on 17 December 1947, further attaching parts of the Prussian Rhine Province and the Bavarian Palatinate (Saarpfalz). Like the former eastern territories of Germany the Saar area was out of the jurisdiction of the Allied Control Council for Germany and thus not part of Allied-occupied Germany. However, unlike the eastern territories, the domestic Saar population was not expelled by the controlling French. With the effect of 1 January 1957, the Saar Protectorate declared its accession to the Federal Republic of Germany, as provided by its Grundgesetz (constitution) art. 23 (Little Reunification), thus becoming the new federal state of Saarland. Kehl was directly annexed to France in 1945 and returned to Germany in 1953.

Poland

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In 1949, there was modest exchange of territory between the Polish People's Republic and the German Democratic Republic (GDR). What is now the1 B 104/B 113 road junction at Linken, Mecklenburg-Western Pomerania to the immediate west of the Polish town of Lubieszyn was transferred from Poland to the GDR in return for a narrow strip of land lying directly on the west side of the road that connected the settlements of Linki and Buk. This move necessitated the creation of a new road linking Lubieszyn to Linki and Buk that mirrored the new shape of the border.[15] In 1951, a small area of land on Usedom Island (Polish: Uznam) was ceded from the German Democratic Republic (Eastern Germany) to Poland. The water pumping station for Świnoujście lies on that land and was therefore handed over to Poland. In return, a similarly-sized area north of Mescherin, including the village of Staffelde (Polish: Staw), was transferred from Poland to the German Democratic Republic.[16] In 1968, East Germany and Poland signed a treaty for the Baltic continental shelf delimitation. On 22 May 1989, East Germany and Poland completed the delimitation of their territorial waters in the Gulf of Szczecin.[citation needed]

See also

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References

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from Grokipedia
The territorial evolution of Germany refers to the profound shifts in the political boundaries and controlled territories of German-speaking regions, spanning from the dissolution of the loosely confederated amid Napoleonic conquests in 1806, through unification as the in 1871 under Prussian leadership following victories over and , territorial contractions imposed by the after , aggressive expansions under the Nazi regime during , forcible partition into Allied and Soviet occupation zones culminating in the establishment of the Federal Republic of Germany and the German Democratic Republic in 1949, and final reunification on October 3, 1990, after the collapse of East German communism. These changes were propelled by successive waves of , dynastic rivalries, and great-power conflicts, resulting in the consolidation of over 300 principalities into a centralized by 1871, only for that entity to lose approximately 13% of its European territory—including Alsace-Lorraine to France, parts of Schleswig to , Posen and to , and Memel to —via the 1919 Versailles settlement, which fueled revanchist sentiments exploited by the subsequent National Socialist government. annexations temporarily expanded German control to include , the , Bohemia-Moravia, and vast Polish, Baltic, and Soviet territories, but defeat led to permanent border reconfigurations, notably the Oder-Neisse line shifting eastern frontiers westward and the expulsion or flight of roughly 12 million ethnic Germans from former eastern provinces and neighboring states like Czechoslovakia and , causing an estimated 500,000 to 2 million deaths from violence, starvation, and exposure in what constituted one of history's largest forced migrations. Postwar division entrenched ideological confrontation along Cold War lines, with West Germany integrating into Western alliances and experiencing economic resurgence while East Germany remained under Soviet influence until mass protests and the Berlin Wall's fall in 1989 enabled treaty-based reunification, restoring pre-1945 western borders while accepting the loss of eastern territories to Poland and the Soviet Union (later Russia). This evolution underscores how territorial integrity in Central Europe has hinged on military outcomes and diplomatic impositions rather than ethnic self-determination alone, with lingering debates over pre-1945 borders reflecting unresolved grievances often minimized in academic narratives due to prevailing institutional sympathies toward postwar status quo arrangements.

Historical Background

Early German Settlements and the Holy Roman Empire

The Germanic peoples, originating from proto-Indo-European speakers who settled in southern Scandinavia and northern Germany around 750 BCE, expanded southward and eastward, occupying territories from the Netherlands to the Vistula River by the late Bronze Age. These tribes, including the Suebi, Cherusci, and Chatti, inhabited the region known to Romans as Magna Germania, east of the Rhine River and north of the Danube, forming a cultural and linguistic continuum distinct from Roman provinces. Archaeological evidence, such as the Jastorf culture associated with early Germanic material remains, indicates semi-nomadic agrarian societies with ironworking and tribal confederations, resisting centralized authority until external pressures like Roman expansion prompted alliances and conflicts. Roman attempts to conquer Germania faltered after the in 9 CE, where Germanic tribes under ambushed and destroyed three Roman legions, effectively halting expansion beyond the Rhine-Danube limes (fortified frontier) established by Emperor around 83 CE. This boundary, stretching approximately 550 kilometers from the to the , demarcated Roman and Superior—territories partially Romanized with auxiliary forts and trade posts—from unconquered tribal lands, preserving Germanic autonomy while facilitating limited cultural exchanges like amber trade. By the CE, pressures from internal Roman crises and external migrations intensified, with tribes such as the and beginning southward movements, though core Germanic heartlands remained fragmented among kinship-based groups rather than unified polities. The (Völkerwanderung) from the 4th to 6th centuries CE saw many Germanic tribes displace Roman authority, with the under conquering by 486 CE and establishing the Merovingian kingdom encompassing modern , western , and the . 's , unified by 800 CE through conquests including (subdued 772–804 CE) and , briefly restored a vast Christian realm from the to the River, crowned as "Emperor of the Romans" by on December 25, 800. The in 843 CE partitioned this empire among Charlemagne's grandsons, creating —roughly corresponding to eastern modern , with stem duchies like , , , and —as the kernel of emerging German territories under . Otto I of Saxony, elected king of East Francia in 936 CE, consolidated power through victories like the Battle of Lechfeld in 955 CE against Magyar raiders, securing the eastern frontier along the and . His coronation as emperor by on February 2, 962, in Rome formalized the , reviving imperial continuity with a German core while incorporating Italian Lombard territories and asserting overlordship over Burgundy and Bohemia. The empire's structure was decentralized, comprising over semi-autonomous duchies and ecclesiastical principalities, with territorial extent fluctuating but centered on the and valleys, excluding Slavic lands east of the until later expansions; this loose confederation emphasized feudal oaths over fixed borders, setting precedents for medieval German fragmentation. By Otto's death in 973 CE, the empire spanned about 1 million square kilometers, blending Germanic tribal legacies with Christian imperial ideology, though internal dynastic rivalries like the (1075–1122) would test its cohesion without altering core territorial foundations.

Rise of Nationalism in the 19th Century

The dissolution of the by in 1806 and the subsequent organization of German states into the French-dominated exposed the vulnerabilities of fragmented polities, fostering early calls for unity based on shared language and culture. French occupation and reforms, while introducing administrative efficiencies, provoked resentment that crystallized during the Wars of Liberation from 1813 to 1815, when Prussian-led coalitions mobilized popular support against French forces, elevating figures like , whose Addresses to the German Nation (1808) articulated a vision of cultural regeneration through education and collective identity. This period marked a shift from dynastic loyalties to proto-national consciousness, as and volunteer units emphasized ethnic solidarity over feudal obligations. The in 1815 reorganized the region into the , a loose alliance of 39 sovereign states presided over by , intended to maintain balance of power but lacking centralized authority or customs barriers, which perpetuated economic inefficiencies and regional rivalries. Conservative measures, including the of 1819, curtailed liberal and nationalist agitation by censoring universities and dissolving student groups like the Burschenschaften, yet underground currents persisted through Romantic intellectuals who romanticized medieval unity and folk traditions as foundations for a greater . , emerging as a counterweight to Austrian influence, advanced economic integration via the customs union established on January 1, 1834, initially linking 18 states and encompassing about two-thirds of German population and territory by the 1840s, which standardized tariffs, boosted internal trade by an estimated 15-20% annually in participating regions, and cultivated interdependence that implicitly challenged the Confederation's stasis. Exclusion of from this framework marginalized Habsburg claims to German leadership, aligning economic pragmatism with Prussian-centric nationalism. The represented the zenith of liberal nationalism, triggered by crop failures, industrial unrest, and demands for constitutions across the , culminating in the Frankfurt National Assembly's convocation on May 18, , as the first freely elected body representing German peoples, which drafted a federal constitution envisioning a hereditary and . Debates over borders—whether to include German-speaking (Großdeutschland) or exclude it for Prussian dominance (Kleindeutschland)—exposed fractures, with the Assembly offering the imperial crown to King on April 3, 1849, who rejected it as a "crown from the gutter" to avoid alienating conservative monarchs. Prussian troops suppressed uprisings in , the Palatinate, and by mid-1849, dissolving the Assembly on May 31, 1849, amid fiscal insolvency and military reversals, revealing nationalism's dependence on monarchical backing rather than alone. These failures underscored territorial fragmentation's persistence, as states reverted to absolutism, yet galvanized a variant prioritizing Prussian military prowess over democratic ideals, paving empirical groundwork for later consolidations without Austria's multi-ethnic encumbrances.

Unification and Imperial Expansion (1815–1918)

Prussian Wars of Unification and Empire Formation

The Prussian wars of unification, orchestrated by Chancellor Otto von Bismarck, encompassed conflicts in 1864, 1866, and 1870–1871 that expanded Prussian territory and integrated disparate German states into a cohesive entity under Prussian hegemony. These victories dismantled the German Confederation, excluded Austria from German affairs, and facilitated the creation of the North German Confederation in 1867, paving the way for the German Empire's proclamation on January 18, 1871, at Versailles. Territorial gains included the duchies of Schleswig-Holstein, several mid-sized kingdoms and free cities, and the provinces of Alsace-Lorraine, increasing the unified entity's land area to approximately 540,000 square kilometers and population to over 41 million. The Second Schleswig War (February–October 1864) arose from Denmark's November 1863 constitutional integration of Schleswig, violating prior agreements on its status relative to Holstein. Prussia, allied with Austria, invaded and defeated Denmark, culminating in the Treaty of Vienna on October 30, 1864, which ceded Schleswig, Holstein, and Lauenburg to joint Prussian-Austrian administration; this added about 15,000 square kilometers and 800,000 inhabitants to Prussian influence, though formal partition awaited the 1866 conflict. The joint control sowed seeds for rivalry, as Bismarck maneuvered to portray Austria as an impediment to German unity. Tensions over Schleswig-Holstein governance escalated into the Austro-Prussian War (June–August 1866), with Prussia's rapid mobilization under General Helmuth von Moltke securing decisive victories, notably at Königgrätz (Sadowa) on July 3. The Peace of Prague (August 23, 1866) excluded Austria from German affairs, dissolved the German Confederation, and enabled Prussian annexations: the Kingdom of Hanover (34,000 sq km, 2.1 million people), Electorate of Hesse-Kassel, Nassau, the Free City of Frankfurt, and full control of Schleswig-Holstein from Austria. These incorporations, effective September–October 1866, bolstered Prussia's industrial base and military manpower, forming the core of the North German Confederation established July 1, 1867, comprising 22 states north of the Main River under Prussian dominance. The Franco-Prussian War (July 19, 1870–May 10, 1871) was provoked by Bismarck's editing of the Ems Dispatch to inflame French opinion, drawing France into conflict over the Spanish throne candidacy. Prussian-led forces, including southern German contingents, achieved swift triumphs, capturing Napoleon III at Sedan on September 2, 1870, and besieging Paris. Southern states—Bavaria, Württemberg, Baden, and Hesse-Darmstadt—aligned with Prussia amid French aggression, enabling full unification. The Treaty of Frankfurt (May 10, 1871) formalized the annexation of Alsace (nearly entirely) and parts of Lorraine (Moselle department), totaling 14,522 sq km and 1.6 million residents, justified by Bismarck as a defensive barrier and compensation for war costs exceeding 5 billion thalers. William I was proclaimed German Emperor on January 18, 1871, in the Hall of Mirrors, Versailles, establishing a federal empire of 25 sovereign states with Prussia comprising two-thirds of its territory and population.

Colonial Acquisitions and Pre-War Adjustments

Germany's colonial expansion commenced in , marking a departure from Otto von Bismarck's earlier aversion to overseas commitments, which he viewed as potential distractions from European power politics. Prompted by advocacy from groups like the German Colonial Society, founded in 1882, and private initiatives, the Reich declared its first African protectorates that year: on 5 July, encompassing coastal areas purchased from local chiefs, and shortly thereafter through treaties with Duala leaders. followed in August 1884, based on concessions obtained by merchant Adolf in present-day . These early claims were formalized amid the , with the of 1884–1885 providing international recognition while regulating European competition. In 1885, Germany extended its holdings with the establishment of , acquired via the under , covering modern , , and through a series of treaties with local rulers often secured under duress or misrepresentation. Pacific acquisitions began concurrently, including the northern , , and parts of in late 1884–1885, administered initially by chartered companies before direct imperial control. By 1899, Germany purchased the Caroline, Mariana, and from following the , bolstering its naval presence in the region. In , the lease of Kiautschou Bay () in 1898, seized after the murder of two German missionaries in 1897, served as a naval base and concession territory in . These territories totaled approximately 2.6 million square kilometers but yielded limited economic returns, with colonial administration marked by high costs and resistance, such as the in (1905–1907). Pre-war territorial adjustments included diplomatic exchanges rather than outright conquests. The Anglo-German of 1 July 1890 resolved overlapping claims in : Britain ceded the island of to Germany, enhancing its naval defenses, while Germany relinquished pretensions to and Witu, recognized British spheres in and , and gained the in for riverine access to . This pact delineated borders along the 1° south latitude in and averted potential conflicts. Further refinements occurred through bilateral agreements, such as the 1899 convention with Britain affirming spheres in the Pacific, but no major European continental changes materialized before 1914, as Germany's focus remained defensive amid the Triple Alliance. These moves reflected ambitions under Kaiser Wilhelm II after 1890, prioritizing global prestige over domestic consolidation.

World War I Territorial Dynamics

During World War I, the pursued territorial control through military occupations on both the Western and Eastern Fronts, aiming to secure resources, buffer zones, and strategic advantages amid a protracted stalemate. On the Western Front, following the Schlieffen Plan's implementation, German forces invaded neutral on August 4, 1914, rapidly occupying approximately 95% of its territory by early October, including key industrial regions and ports, while a narrow coastal strip remained under Belgian-Allied control. Concurrently, German armies advanced into northern , holding departments such as Nord, , and parts of , encompassing coal-rich areas that supplied up to 80% of France's pre-war iron production, thereby bolstering Germany's through exploitation and forced labor. These occupations, administered under military governance, involved systematic resource extraction, with Germany deporting over 120,000 Belgian workers to its factories by 1917, though they faced Allied counter-pressure and guerrilla resistance without yielding permanent territorial integration. On the Eastern Front, German advances after the 1914 Tannenberg victory enabled the establishment of , a formalized in 1915 under , overseeing occupied territories in present-day , , (Courland), , and parts of , spanning roughly 150,000 square kilometers and a population of about 10 million by 1918. implemented , infrastructure projects like railways for resource transport, and policies favoring German settlement while suppressing local autonomy to prioritize supply lines for the front and homeland. The 1917 and subsequent Bolshevik withdrawal facilitated further gains; the , signed March 3, 1918, compelled Soviet Russia to cede independence to Poland, , Courland, , , and significant Ukrainian territories (including the grain-rich "breadbasket" regions), effectively placing them under German influence as planned puppet states or economic dependencies, adding over 1 million square kilometers temporarily to German sphere control. Against , which entered the war on the Allied side in August 1916, German-Bulgarian-Austro-Hungarian forces overran the country by December 1916, leading to the Treaty of Bucharest on May 7, 1918, which demilitarized Romania, ceded to , and granted Germany long-term economic concessions over Romanian oil fields (producing 10% of global supply) and agricultural output without formal of core Romanian lands. These wartime dynamics reflected Germany's opportunistic expansionism, driven by blockade-induced shortages and visions of economic dominance, yet proved ephemeral: the November 11, 1918, Armistice required immediate evacuation of all occupied areas, reversing gains as Allied offensives and internal collapse eroded holding capacity.

Interwar Instability and Nationalist Revanchism (1919–1933)

Treaty of Versailles Imposed Losses

The Treaty of Versailles, signed on 28 June 1919 in the Hall of Mirrors at the Palace of Versailles, imposed extensive territorial concessions on the German Empire as a penalty for its role in World War I, reducing its pre-war European land area by approximately 13 percent (over 70,000 square kilometers) and its population by about 10 percent (6.5 to 7 million people). These provisions, outlined primarily in Articles 27 to 51 and subsequent sections, were presented to German delegates as a non-negotiable ultimatum, with threats of renewed Allied invasion if rejected, leading to widespread German resentment over the terms' perceived severity and lack of reciprocity. In the west, Germany was compelled to return Alsace-Lorraine—annexed from France in 1871—to French sovereignty under Article 51, encompassing roughly 14,522 square kilometers and 1.8 million residents, the majority of whom were German-speaking but included significant French populations in border areas. Smaller adjustments included the cession of Eupen and Malmedy (about 1,000 square kilometers) to Belgium, confirmed by a 1920 plebiscite favoring transfer despite local German majorities, and the northern portion of Schleswig to Denmark following plebiscites in 1920 that reflected ethnic Danish majorities in those zones. The Saar Basin, a coal-rich territory of 1,900 square kilometers, was detached and placed under a 15-year administration by the League of Nations, with its mines effectively ceded to French control until a 1935 plebiscite returned it to Germany. Eastern losses were more disruptive, aimed at reconstituting Poland as specified in Article 87. Germany surrendered the (Poznań) and most of —totaling around 50,000 square kilometers and 4 million people, including substantial German minorities—to , forming the "" that bisected German territory and isolated from the mainland. The port city of Danzig (), with its majority German population of 350,000, was designated a Free City under oversight to ensure Polish access to the , per Article 108. In , a 1921 plebiscite favored Germany overall, but Polish uprisings and arbitration awarded the industrial eastern third (about 3,300 square kilometers) to Poland, depriving Germany of key zinc and coal resources despite ethnic German majorities in affected districts. Beyond Europe, Article 119 mandated the forfeiture of all German overseas colonies—spanning 2.6 million square kilometers in , the Pacific, and —to Allied mandates, eliminating Germany's imperial holdings without compensation. The and a 50-kilometer-wide bridgehead on the right bank of the were demilitarized indefinitely under Articles 42-44, barring fortifications or troops to serve as a buffer against future aggression, though no territorial transfer occurred there. These cessions, enforced amid economic distress and without plebiscites in many ethnic German areas, fueled revanchist sentiments in Weimar Germany, as they disrupted historical provinces, severed economic lifelines like Silesian industry, and prioritized Allied strategic interests over self-determination principles selectively applied elsewhere.

Plebiscites, Uprisings, and Nationalist Claims

The Treaty of Versailles mandated plebiscites in several disputed border regions to determine their affiliation, including Schleswig, the Allenstein and Marienwerder districts of East Prussia, and Upper Silesia. In Schleswig, divided into northern and southern zones, the northern zone voted on February 10, 1920, with 75,431 favoring Denmark and 25,328 favoring Germany, while the southern zone on March 14, 1920, produced a majority for Germany, resulting in the northern portion's transfer to Denmark and the southern remaining German. In East Prussia, the Allenstein plebiscite area on July 11, 1920, saw 97% vote to remain with Germany, and the Marienwerder area recorded 96,923 votes for Germany against 8,018 for Poland, preserving both districts for Germany with minor adjustments for five Polish-majority villages. The plebiscite on March 20, 1921, yielded 59.4% votes for and 40.6% for across the region, reflecting its mixed ethnic composition and industrial significance. However, the Third Silesian Uprising, erupting on the night of May 2–3, 1921, involved Polish insurgents seizing key industrial areas amid disputes over the plebiscite's implementation, escalating violence that influenced . Prior uprisings had set the stage: the First Silesian Uprising in August 1919, triggered by a German of ten miners at the mine on August 15, was suppressed by German forces by August 24; the Second in August 1920, amid Poland's victories in the Polish-Soviet War, was halted by Allied intervention. The uprisings' military outcomes, particularly the Third's control of the industrial triangle, prompted the Council of Ambassadors and in October 1921 to divide contrary to strict plebiscite majorities, awarding approximately one-third of the territory—including the vital and districts—despite Germany's overall vote advantage, while Germany retained the larger agricultural areas. This partition, covering about 3,350 square kilometers to with 1 million inhabitants, prioritized economic viability and ethnic concentrations over raw vote totals, heightening German grievances. German nationalist groups, including the (DNVP) and emerging National Socialists, rejected these plebiscite results and territorial losses as unjust impositions, advancing claims on areas with ethnic German majorities such as the , Danzig, parts of , , and northern Schleswig. These demands, propagated through propaganda and political agitation, portrayed the Versailles borders as artificial divisions severing historic German lands and populations—totaling over 13% of prewar territory and 10% of the population—fueling revanchist sentiment that undermined stability without immediate territorial gains by 1933.

Rhineland Remilitarization and Saar Status

The Saar Basin, encompassing approximately 1,900 square kilometers and a population of around 800,000, was detached from German sovereignty under Articles 45–50 of the in 1919. These provisions granted perpetual ownership and exploitation rights over the region's coal mines as partial reparations for wartime destruction in northern , while placing the territory under administration for 15 years, after which a plebiscite would determine its future: rejoining , joining , or maintaining the . The plebiscite occurred on January 13, 1935, with 528,705 votes cast out of 539,541 eligible voters, yielding an overwhelming majority—approximately 91 percent—for reunion with , 8.8 percent for the , and negligible support for . The result reflected strong ethnic German identification and resentment toward the economic exploitation favoring , leading to the territory's formal reintegration into effective March 1, 1935, thereby restoring a modest portion of pre-1919 German land and industrial capacity. The , a broader region west of the Rhine River already under German civil administration but designated a by Articles 42–44 of Versailles and reaffirmed by the 1925 Locarno Pact, prohibited German troops or fortifications within 50 kilometers of the river's east bank and in specified bridgeheads. On March 7, 1936, ordered the advance of about 20,000–30,000 German troops into the zone, directly violating both treaties and Locarno's mutual guarantees by Britain, , , and . France mobilized forces along the border but refrained from military response due to domestic political divisions and Britain's reluctance for confrontation, allowing Germany to consolidate the reoccupation without resistance; Hitler later described it as his first gamble, testing Allied resolve. While not altering territorial boundaries—the Rhineland remained German soil—the action nullified demilitarization constraints, enhancing Germany's defensive posture and strategic depth against , and signaled the progressive erosion of Versailles restrictions.

Nazi Territorial Aggression (1933–1945)

Anschluss and Initial Expansions

The , executed on 12 March 1938, represented Nazi Germany's initial major territorial annexation, incorporating the entirety of into the without military opposition. Following intense diplomatic pressure from , including threats of invasion, Austrian Chancellor resigned on 11 March, paving the way for pro-Nazi to assume power and invite German troops across the border. German forces, numbering around 200,000, advanced rapidly, reaching by 13 March, where Hitler proclaimed the union of the two nations. This act directly contravened the Treaty of Saint-Germain (1919), which explicitly forbade Austrian unification with Germany, yet elicited no armed response from Britain, , or other signatories of the post-World War I order. Austria's territory, spanning approximately 83,855 square kilometers, was fully absorbed, increasing the 's land area by about 18% and its population by roughly 6.8 million, thereby bolstering economic resources such as Austrian gold reserves (valued at around 100 million Reichsmarks transferred to ) and industrial capacity. Administratively, the independent Republic of was dismantled; its nine federal states were abolished, and the region redesignated as the Ostmark province under Reich Commissioner . By late 1938, this was subdivided into seven Reichsgaue—Oberdonau, Niederdonau, Steiermark, Kärnten, , Tirol-Vorarlberg, and the enlarged —to align with Nazi governance, facilitating centralized control and the extension of racial policies, including the immediate of Jewish property. A plebiscite held on 10 1938, alongside Reichstag elections, purportedly affirmed the annexation, with official tallies reporting 99.73% approval on a 99.71% turnout among eligible voters (excluding and political opponents). While Nazi orchestration, including campaigns and voter intimidation, rendered the results non-representative of uncoerced sentiment, contemporary accounts indicate substantial pan-German enthusiasm among ethnic Germans in both countries, driven by shared cultural ties, economic depression in , and resentment toward the Versailles system. The unopposed success of the provided Hitler with enhanced , military from the Austrian Bundesheer (integrated into the ), and political momentum for subsequent border revisions, demonstrating the ineffectiveness of in deterring .

Munich Agreement and Czechoslovakia Dismantlement

The was signed on September 29, 1938, by representatives of , the , , and , permitting the annexation of the —a border region of predominantly inhabited by ethnic Germans—by . The agreement stipulated the evacuation of Czechoslovak forces and civilians from the between October 1 and 10, 1938, followed by German occupation, with provisions for a potential plebiscite in disputed areas and an international commission to oversee implementation. The encompassed approximately 3 million ethnic Germans and represented a strategic frontier zone with fortifications that had heavily invested in for defense. In the wake of the , the dismemberment of accelerated as neighboring states capitalized on its weakened state. On October 30, 1938, annexed the Teschen (Tesin) region, a contested area with a Polish majority, comprising about 1,000 square kilometers and 250,000 inhabitants. Subsequently, the on November 2, 1938, mediated by and , awarded southern and parts of , totaling around 11,927 square kilometers and 869,000 people, mostly Hungarian speakers. These territorial losses, combined with the Sudetenland's cession—which stripped of roughly 30% of its population and 40% of its industrial capacity—left the militarily vulnerable and economically crippled, without Allied guarantees of its new borders as initially proposed. By early 1939, internal pressures in the remaining , exacerbated by German encouragement of Slovak separatism, culminated in Slovakia's declaration of independence as a nominally on March 14, aligned with . The following day, March 15, 1939, German forces invaded the without resistance, occupying and Moravia; proclaimed the establishment of the Protectorate of Bohemia and Moravia from , with retained as a figurehead president under German oversight. This protectorate, while formally distinct from direct , placed the territory under de facto German administration via a Protector, integrating its and resources into the Nazi and effectively extending German control over central Europe's industrial heartland. The occupation violated the Munich Agreement's assurances and marked a pivotal escalation in Nazi expansionism, as absorbed the Czech lands' advanced armaments production without formal incorporation into the until wartime plans for full Germanization.

Wartime Annexations and Occupations

Following the invasion of Poland on September 1, 1939, Nazi Germany annexed approximately 92,500 square kilometers of western Polish territory, representing about one-third of Poland's pre-war area. On October 8, 1939, Adolf Hitler issued a decree formally incorporating these regions into the German Reich, creating the Reichsgaue Danzig-Westpreußen and Posen (later renamed Wartheland), while expanding existing gaue such as Schlesien and Oberschlesien to include additional Polish lands with ethnic German populations and industrial resources. The annexed areas, home to over 10 million people including significant Polish majorities, underwent rapid Germanization, involving population transfers, expulsions of Poles, and settlement of ethnic Germans. The unannexed central portion of occupied Poland, spanning about 95,000 square kilometers, was established as the General Government on October 12, 1939, under Hans Frank's civil administration as a reservation for exploitation and eventual clearance of non-Germans. After the fall of France in June 1940, Germany reincorporated Alsace and the department of Moselle from Lorraine into the Reich, despite the June 22 armistice not stipulating formal annexation. Alsace was merged into the Gau Baden-Elsaß, and Moselle into Gau Westmark (Saarpfalz), with policies enforcing German language, citizenship revocation for Jews and "undesirables," and mass expulsions of French citizens. These territories, ceded to France after World War I, totaled around 14,500 square kilometers and were treated as integral Reich provinces for military and economic purposes. Luxembourg, invaded on May 10, 1940, initially fell under civilian occupation but was fully annexed on August 30, 1942, via decree, integrated into the expanded (formerly Koblenz-Trier), with its 300,000 inhabitants subjected to and Germanization efforts that sparked a . In the Balkans, following the April 1941 conquest of , Germany directly annexed northern Slovenia's Lower Styria (about 6,500 square kilometers) into Gau Steiermark and into Gau Kärnten, displacing and resettling Germans to consolidate border regions. The remainder of was partitioned among , with under direct German . Germany's occupations extended across Western and Northern Europe after spring 1940 campaigns. , occupied April 9, 1940, retained a semblance of under civilian administration until its dissolution in August 1943, covering 43,000 square kilometers. , seized the same day, endured harsh military governance over 385,000 square kilometers, with quisling Vidkun Quisling's regime providing nominal collaboration. The Netherlands, , and northern , conquered in May 1940, were administered militarily, encompassing 42,000, 30,000, and over 100,000 square kilometers respectively, with economies geared toward German war needs. operated as the until occupation. The June 22, 1941, invasion of the led to occupation of vast eastern territories, including the , Belarus, , and western Russia, totaling over 1.5 million square kilometers by 1942, organized into Reichskommissariats Ostland and Ukraine for resource extraction, forced labor, and planned ethnic cleansing under , though full annexation was deferred pending victory. These zones, exploited for grain and labor, saw millions deported or killed as part of racial and economic policies. In and other Balkan areas post-1941, military occupations facilitated Axis control amid partisan resistance.

Postwar Dismemberment and Division (1945–1990)

Allied Conferences and Immediate Redrawings

The Yalta Conference, held from February 4 to 11, 1945, between U.S. President Franklin D. Roosevelt, British Prime Minister Winston Churchill, and Soviet Premier Joseph Stalin, established preliminary agreements on the postwar administration of Germany. The leaders concurred on dividing Germany into four occupation zones controlled by the United States, United Kingdom, Soviet Union, and France, with Berlin similarly partitioned into four sectors accessible via specified land corridors. These arrangements aimed to facilitate joint Allied governance through a central Allied Control Council, though definitive territorial boundaries remained unresolved pending further negotiation. Following Germany's on May 8, 1945, the from July 17 to August 2, 1945—attended by U.S. President , British Prime Minister (later ), and —formalized the occupation framework. The conference delineated specific zonal boundaries: the Soviet zone encompassed eastern Germany up to a line roughly along the River, including , , , , and parts of ; the British zone covered the northwest, including , , and ; the U.S. zone included the south, such as and ; and the French zone comprised the southwest, including the and . Berlin's sectors mirrored this division, with the Western Allies' access guaranteed despite its location deep within the Soviet zone. Potsdam also addressed eastern territorial adjustments provisionally, recognizing Polish administration over areas east of the Oder-Neisse line—encompassing former German territories like , , and (minus the northern area ceded to the USSR)—as a temporary measure until a final settlement. This facilitated the de facto transfer of control to Polish authorities under Soviet influence, accompanied by agreements for the organized transfer of German populations from these regions. The conference emphasized Germany's demilitarization, , , and (the "four Ds"), with reparations primarily drawn from each zone's resources, though the Soviets extracted significant assets from their sector and portions from western zones. Implementation commenced immediately after Potsdam, with Allied forces assuming zonal responsibilities by late August 1945 via the , established on August 30. These divisions, intended as administrative, solidified into enduring geopolitical fault lines, as no comprehensive materialized due to emerging tensions. The provisional eastern border shifts, driven by Soviet strategic imperatives and Polish claims, marked the initial postwar redrawing of Germany's pre-1937 frontiers, annulling Nazi-era expansions without formal adjudication.

Eastern Expulsions and Oder-Neisse Line

At the from July 17 to August 2, 1945, the Allied leaders agreed to place the administration of all German territories east of the and rivers under Polish authority, pending a final peace settlement, effectively establishing the Oder-Neisse line as 's provisional western border. The conference communiqué also endorsed the transfer of the German civilian population from Poland, , and to , stipulating that such population transfers should proceed in an "orderly and humane" manner. This decision formalized earlier Soviet-Polish agreements shifting 's borders westward, compensating for territories lost to the in the east. The expulsions and flights displaced approximately 12 million ethnic Germans from eastern German provinces such as , , and , as well as from in and other regions in between 1944 and 1950. These population movements included both organized expulsions by receiving states and chaotic flights amid advancing Soviet and Polish forces, resulting in the near-complete removal of German minorities from these areas. By 1950, the process had resettled most expellees in occupied and , significantly altering demographic compositions and contributing to a 20% population increase in from 1939 to 1950 despite wartime losses. Conditions during the transfers were often brutal, marked by , , , and exposure, leading to substantial ; scholarly estimates place the death toll from expulsions and related flights at 500,000 to 600,000, though higher figures up to 2 million have been cited in some German government reports. Factors included in camps, forced marches, and inadequate Allied oversight, contradicting the intent for humane conduct. The Oder-Neisse line received initial formal recognition from the German Democratic Republic (GDR) via the Zgorzelec Agreement with on July 6, 1950, establishing it as the GDR's eastern boundary. The Federal Republic of Germany (FRG) initially rejected the border, maintaining claims to the lost territories until Willy Brandt's ; the Treaty of Warsaw, signed on December 7, 1970, saw the FRG acknowledge the inviolability of Poland's western border along the Oder-Neisse line in exchange for normalized relations. Final definitive recognition came with the German-Polish Border Treaty of 1990 following reunification, confirming the line as permanent without territorial revisions.

Western Adjustments and Zonal Divisions

Following 's unconditional surrender on May 8, 1945, the Allied powers divided the country into four occupation zones administered by the , , , and , with similarly sectorized despite its location within the Soviet zone. The western zones—American, British, and French—encompassed approximately the western two-thirds of , with the American zone covering southern and western areas including and , the British zone northern and western regions like and , and the French zone southwestern territories including parts of and the . These divisions, initially outlined at the in February 1945 and formalized at in August 1945, aimed to facilitate joint administration but soon highlighted ideological divergences. Economic reconstruction challenges in the western zones prompted administrative adjustments to streamline governance and recovery. On January 1, 1947, the and merged their zones into "Bizonia," creating a unified economic council and central administration to address food shortages, industrial disarray, and currency instability more effectively. This merger violated the Agreement's principle of separate zonal authority but was driven by practical necessities, as both powers faced unsustainable occupation costs exceeding $1 billion annually by 1946. France initially resisted integrating its zone due to security concerns and desires for territorial concessions, maintaining the as a separate . Established in February 1946, the covered 2,568 square kilometers with a population of about 950,000, administered by with economic ties to it via a enacted in 1947, supplying 20% of 's coal and 15% of its iron and steel. Politically autonomous under French oversight, the Saar issued its own and stamps, reflecting France's aim to detach it permanently from . By April 1949, escalating tensions and the Soviet blockade of (June 1948–May 1949) compelled to join Bizonia, forming "Trizonia" and paving the way for the Federal Republic of Germany (West Germany) proclaimed on May 23, 1949. The Currency Reform of June 20, 1948, introducing the exclusively in the western zones, further solidified economic separation from the Soviet zone, boosting industrial output by 50% within a year. Western borders remained largely unchanged from pre-war configurations, with Alsace-Lorraine reverting to and minor enclaves resolved bilaterally, but the Saar's status persisted as the primary adjustment until a 1954 agreement linked it to the . A referendum on October 23, 1955, saw 67.7% of Saar voters reject Europeanization in favor of reunification with West Germany, leading to its reintegration as the state of Saarland on January 1, 1957, after transitional Franco-German accords. Allied occupation of West Germany formally ended on May 5, 1955, with the entry into force of the Bonn–Paris conventions, granting sovereignty while retaining limited rights in Berlin and NATO integration. These zonal mergers and Saar resolution stabilized West Germany's western frontiers, contrasting with eastern shifts and enabling the "Wirtschaftswunder" economic miracle.

Formal Division into FRG and GDR

The Federal Republic of Germany (FRG), commonly known as , was formally established on 23 May 1949, when the Parliamentary Council convened in and proclaimed the as the provisional constitution for the western occupation zones. The had been adopted on 8 May 1949, emphasizing parliamentary democracy, , and , with the explicit aim of eventual reunification under free conditions. This followed the failure of the Allied Council to agree on a unified German government, exacerbated by the Soviet of from 1948 to 1949, which prompted Western integration efforts including currency reform and economic recovery via the . The FRG's territory encompassed the combined American, British, and French zones of occupation, covering approximately 248,000 square kilometers and organized into eleven constituent : , , , , , , , , , , and . Excluded were the , under French administration until its accession to the FRG in 1957, and , which functioned as an associated entity despite formal Allied oversight. Initial sovereignty was limited by the Occupation Statute, which reserved certain powers to the until 1955. In the Soviet occupation zone, the German Democratic Republic (GDR), or East Germany, was proclaimed on 7 October 1949, following the convening of the Provisional People's Chamber from the third German People's Congress. The GDR's constitution established a socialist state under the leadership of the Socialist Unity Party (SED), modeled on Soviet structures, with Otto Grotewohl as Minister President forming a government including bloc parties. Its territory comprised the Soviet zone, spanning about 108,000 square kilometers and initially divided into five Länder: Brandenburg, Mecklenburg-Vorpommern, Saxony, Saxony-Anhalt, and Thuringia; these were reorganized into 14 districts (Bezirke) in 1952 for centralized control. East Berlin served as the capital, while the GDR claimed authority over all Berlin, though West Berlin remained outside its effective control. The formal division into FRG and GDR crystallized the postwar zonal boundaries as de facto state borders, severing administrative unity and initiating the as a heavily fortified line, though both entities initially professed goals of unification— the FRG under democratic terms and the GDR under socialist principles. Western Allies recognized the FRG promptly, while the GDR received legitimacy primarily from the Soviet bloc, reflecting broader alignments; full international recognition for the GDR lagged until the . This bifurcation excluded territories lost to Poland and the Soviet Union per the , with no provision for revision in the founding documents.

Reunification and Border Stabilization (1990–Present)

Collapse of GDR and Unification Process

The German Democratic Republic (GDR) faced mounting internal pressures in the late 1980s, driven by chronic economic stagnation, shortages of consumer goods, and widespread dissatisfaction with the Socialist Unity Party () regime's authoritarian control. By mid-1989, over 30,000 East Germans had fled via and to , exacerbating labor shortages and prompting the regime to seal borders temporarily. These factors, compounded by the weakening grip of Soviet influence under Mikhail Gorbachev's and policies, eroded the GDR leadership's ability to suppress dissent. Mass protests erupted as part of the , beginning with Monday demonstrations in on September 4, 1989, initially organized by opposition groups around the Nikolaikirche for prayers and calls for reform. Attendance swelled rapidly, reaching 70,000 by October 9 and 300,000 by October 23, with demonstrators demanding free elections, freedom of travel, and an end to dominance, yet avoiding violence despite security forces' readiness to intervene. The protests spread to and other cities, forcing leader Erich Honecker's resignation on October 18, 1989, and accelerating the regime's collapse. The symbolic breakthrough occurred on November 9, 1989, when Politburo member announced immediate travel freedoms across the , misinterpreted as an order to open checkpoints amid crowds at the . East and West Berliners dismantled sections of the 155-kilometer barrier that night, marking the de facto end of the GDR's territorial isolation and initiating uncontrolled migration westward, with over 2 million East Germans visiting the West by year's end. This event undermined the GDR's sovereignty, as border controls eroded without military enforcement. Federal Republic of Germany (FRG) Chancellor responded with a Ten-Point Plan for unification on November 28, 1989, emphasizing stepwise integration starting with economic ties. The first free GDR elections on March 18, 1990, resulted in victory for the pro-unification coalition, led by the Christian Democratic Union, paving the way for rapid merger. A Treaty on Monetary, Economic, and Social Union, signed May 18, 1990, and effective July 1, introduced the in the GDR, aligning economies but exposing eastern industrial weaknesses. The Unification Treaty, signed August 31, 1990, between the FRG and GDR, provided for the GDR's dissolution and accession of its five re-established states (, , , , ) plus to the FRG under Article 23 of the , effective October 3, 1990, thereby reuniting the territories without altering external frontiers. Concurrently, the Two Plus Four Treaty, signed September 12, 1990, by the two German states and the four Allied powers (, , , ), restored full to unified , confirmed the Oder-Neisse line as the eastern border, and mandated Soviet troop withdrawal by 1994. This process integrated approximately 108,000 square kilometers of GDR territory into the FRG's federal structure, creating a single state of 357,000 square kilometers.

Border Treaties and Loss Recognitions

The Treaty on the Final Settlement with Respect to , signed on September 12, 1990, by the two German states and the four Allied powers (, , , and ), established the framework for recognizing Germany's postwar borders as final and irrevocable. This agreement, often called the Two Plus Four Treaty, explicitly confirmed that the united comprised only the territories of the Federal Republic of Germany (FRG), the German Democratic Republic (GDR), and , thereby renouncing any territorial claims beyond these boundaries, including those lost after such as areas east of the Oder-Neisse line transferred to and the . Article 1 of the treaty delimited Germany's extent, while subsequent provisions ensured no revisionist demands, addressing long-standing Polish and Soviet concerns over potential German . Building on this, the German-Polish Border Treaty of November 14, 1990, signed in by Foreign Ministers and Krzysztof Skubiszewski, formally confirmed the Oder-Neisse line as the permanent and inviolable border between Germany and . Ratified by both parliaments in 1991, the treaty obligated the parties to respect each other's sovereignty and territorial integrity, effectively ending decades of ambiguity since had refused to recognize the GDR's 1950 treaty with under the . This recognition entailed accepting the loss of approximately 114,000 square kilometers of pre-1937 German territory, including (beyond ), , and , which had been populated by millions of ethnic Germans expelled postwar. Relations with Czechoslovakia transitioned more through declarations than dedicated border treaties, as the Two Plus Four framework implicitly upheld the postwar borders, including those adjusted after the 1945 reversal of the ceding the . The Czech-German Declaration on Mutual Relations and Their Future Development, signed on December 21, 1992, and supplemented in 1997, focused on reconciliation and cooperation without altering boundaries, affirming no territorial claims while addressing historical grievances like the Beneš Decrees. These instruments collectively stabilized Germany's borders, precluding further adjustments and integrating the country into a European framework emphasizing inviolability under the Conference on Security and Co-operation in Europe principles. No significant territorial disputes have arisen since, with minor technical border demarcations resolved bilaterally.

Modern Stability and Minor Adjustments

Following reunification on October 3, 1990, 's external borders have remained fixed, encompassing 357,022 square kilometers without any net territorial gains or losses. The on the Final Settlement with Respect to , signed September 12, 1990, in Moscow by the two German states and the four victorious Allied powers, definitively confirmed the unified state's frontiers as the combined external boundaries of the former of and German Democratic Republic, explicitly prohibiting any alterations and resolving residual postwar Allied rights over German territory. This agreement, entering into force March 15, 1991, after ratifications, marked the legal endpoint of divisions and enabled full German sovereignty. Complementing this, the German-Polish Border Treaty of November 14, 1990, established the Oder-Neisse line—set provisionally at the 1945 —as the permanent, inviolable eastern frontier, with both governments mutually renouncing all territorial claims beyond it and pledging non-aggression. Ratified by unified 's Bundestag in 1991, the treaty facilitated Poland's border security and precluded revanchist movements within , though some conservative voices initially resisted formal recognition of the line's finality. Bilateral pacts with other neighbors, including the 1991 German-Polish Treaty of Good Neighbourship and Friendly Cooperation, reinforced these borders through commitments to minority protections and economic ties without territorial concessions. Germany's subsequent treaties echoed this pattern of confirmation rather than change. For instance, the 1992 joint declaration with (superseded by the post-1993 Velvet Divorce) affirmed the existing northwestern border while acknowledging historical Sudeten German expulsions, explicitly barring future claims. Analogous understandings with , the , , , , and upheld pre-1990 lines, often tied to integration—Germany joined the on January 1, 1993, followed by implementation in 1995, which abolished routine border controls but preserved delimited sovereignty. Internally, minor administrative realignments occurred without impacting external territory, such as the restoration of the five GDR (Brandenburg, , , , ) effective October 3, 1990, and Berlin's consolidation as a single from its divided status. These adjustments, governed by the Unification Treaty of August 31, 1990, aligned eastern structures with western but involved no land transfers. River course shifts, like those along the or , have prompted occasional demarcation clarifications under existing treaties, yet these technical fixes—totaling negligible areas—have not altered overall boundaries or prompted disputes. By forswearing in its (Article 26) and embedding stability in and EU frameworks, Germany has sustained this equilibrium, with no active territorial as of 2025.

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