An Act for the Release of certain Persons held to Service or Labor in the District of Columbia, 37th Cong., Sess. 2, ch. 54, 12 Stat. 376, known colloquially as the District of Columbia Compensated Emancipation Act or simply Compensated Emancipation Act, was a law that ended slavery in the District of Columbia, while providing slave owners who remained loyal to the United States in the then-ongoing Civil War to petition for compensation. Although not written by him, the act was signed by U.S. President Abraham Lincoln on April 16, 1862. April 16 is now celebrated in the city as Emancipation Day.

Washington, D.C., formally the District of Columbia and commonly called Washington or D.C., is the capital city and federal district of the United States. The city is on the Potomac River, across from Virginia, and shares land borders with Maryland to its north and east. Washington, D.C., was named for George Washington, a Founding Father and the first president of the United States. The district is named for Columbia, the female personification of the nation.