District of Columbia (until 1871)

The District of Columbia was created in 1801 as the federal district of the United States, with territory previously held by the states of Maryland and Virginia ceded to the federal government of the United States for the purpose of creating its federal district, which would encompass the new national capital of the United States, the City of Washington. The district came into existence, with its own judges and marshals, through the District of Columbia Organic Act of 1801; previously it was the Territory of Columbia. According to specific language in the U.S. Constitution, it was 100 square miles (259 km²).

The district encompassed three small cities: Alexandria, formerly in Virginia, Georgetown, formerly Maryland, and the deliberately planned central core, the City of Washington. Both the White House and the United States Capitol were already completed and in use by 1800 as called for by the 1791 L'Enfant Plan for the City of Washington, although the city was not formally chartered until 1802. Beyond those cities, the remainder of the district was farmland organized by the 1801 Act into two counties, Washington County, D.C., on the Maryland side, and Alexandria County, D.C., on the Virginia side, encompassing today's Arlington County, Virginia, and the independent city of Alexandria.

The district was governed directly by the U.S. Congress from the beginning. Alexandria City and County were ceded back from the federal government to the commonwealth of Virginia in 1846, in a process known as retrocession, anticipating the 1850 ban on slave trading (but not slavery) in the district.

Washington and Georgetown retained their separate charters for seventy years, until the District of Columbia Organic Act of 1871. That act cancelled the charters of the towns and brought the entire area within the district borders under one district government, ending any distinction between "the District of Columbia" and "Washington", making the two terms effectively synonymous.^[1]