United States Capitol

The United States Capitol, often called the Capitol or the Capitol Building, is the seat of the United States Congress, the legislative branch of the federal government. It is located on Capitol Hill at the eastern end of the National Mall in Washington, D.C. Although no longer at the geographic center of the national capital, the U.S. Capitol forms the origin point for the street-numbering system of the district as well as its four quadrants. Like the principal buildings of the executive and judicial branches, the Capitol is built in a neoclassical style and has a white exterior.

Central sections of the present building were completed in 1800, when the 6th U.S. Congress convened there on November 17, 1800, moving the national capital from Philadelphia to Washington, D.C.. The building was partly destroyed in the 1814 Burning of Washington by the British, then was fully restored within five years. The building was enlarged during the 19th century, by extending the wings for the chambers for the bicameral legislature as more states were admitted to the union, with the House of Representatives housed in the south wing and the Senate housed in the north wing. The massive dome was completed around 1866 just after the American Civil War. The east front portico was extended in 1958. The building's Visitors Center was opened in the early 21st century.

Both its east and west elevations are formally referred to as fronts, although only the east front was intended for the reception of visitors and dignitaries, while the west front is now used for presidential inauguration ceremonies. The building and grounds are overseen by the architect of the Capitol, who also oversees the surrounding Capitol Complex.

Prior to establishing the nation's capital in Washington, D.C., the United States Congress and its predecessors met at Independence Hall and Congress Hall in Philadelphia, Federal Hall in New York City, and five additional locations: York, Pennsylvania, Lancaster, Pennsylvania, the Maryland State House in Annapolis, Maryland, and Nassau Hall in Princeton, New Jersey, and Trenton, New Jersey. In September 1774, the First Continental Congress brought together delegates from the colonies in Philadelphia, followed by the Second Continental Congress, which met from May 1775 to March 1781.

After adopting the Articles of Confederation in York, Pennsylvania, the Congress of the Confederation was formed and convened in Philadelphia from March 1781 until June 1783, when a mob of angry soldiers converged upon Independence Hall, demanding payment for their service during the American Revolutionary War. Congress requested that John Dickinson, the Governor of Pennsylvania, call up the militia to defend Congress from attacks by the protesters. In what became known as the Pennsylvania Mutiny of 1783, Dickinson sympathized with the protesters and refused to remove them from Philadelphia. As a result, Congress was forced to flee to Princeton, New Jersey, on June 21, 1783, and met in Annapolis, Maryland, and Trenton, New Jersey, before ending up in New York City.

The U.S. Congress was established upon ratification of the U.S. Constitution and formally began on March 4, 1789. New York City remained home to Congress until July 1790, when the Residence Act was passed to pave the way for a permanent capital. The decision of where to locate the capital was contentious, but Alexander Hamilton helped broker a compromise in which the federal government would take on war debt incurred during the American Revolutionary War, in exchange for support from northern states for locating the capital along the Potomac River. As part of the legislation, Philadelphia was chosen as a temporary capital for ten years (until December 1800), until the nation's capital in Washington, D.C., would be ready.

Pierre L'Enfant was charged with creating the city plan for the new capital city and the major public buildings. The Congress House would be built on Jenkins Hill, now known as Capitol Hill, which L'Enfant described as a "pedestal awaiting a monument." L'Enfant connected Congress House with the President's House via Pennsylvania Avenue with a width set at 160 feet, identical to the narrowest points of the Champs-Élysées in Paris. Westwards was a 400-foot-wide (122 m) garden-lined "grand avenue" containing a public walk (later known as the National Mall) that would travel for about 1 mile (1.6 km) along the east–west line.

The term "Capitol" (from Latin Capitolium) originally denoted the Capitoline Hill in Rome and the Temple of Jupiter that stood on its summit. The Roman Capitol was sometimes misconceived of as a meeting place for senators, and this led the term to be applied to legislative buildings; the first such building was the Williamsburg Capitol in Virginia. Thomas Jefferson had sat here as a member of the House of Burgesses, and it was he who applied the name "Capitol" to what on L'Enfant's plan had been called the "Congress House". "Capitol" has since become a general term for government buildings, especially in the United States. It is often confused with "capital"; one, however, denotes a building or complex of buildings, while the other denotes a city.