Adolf Hitler
Adolf Hitler
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World War II and Military Campaigns

Hitler's aggressive foreign policy and expansionist ideology led to the outbreak of World War II.
Invasion of Poland
1 September 1939
Germany invaded Poland, prompting the United Kingdom and France to declare war.
Western Campaign
1940
Germany launched successful campaigns in Western Europe, conquering France, Belgium, and the Netherlands.
Operation Barbarossa
22 June 1941
Germany invaded the Soviet Union, opening the Eastern Front.
Declaration of War on the United States
11 December 1941
Following Japan's attack on Pearl Harbor, Hitler declared war on the United States.