Washington, D.C.

Washington, D.C., officially the District of Columbia and commonly known as simply Washington or D.C., is the capital city and federal district of the United States. The city is split from Virginia to its southwest by the Potomac River and shares land borders with Maryland to its north and east. It was named after 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.

The U.S. Constitution in 1789 called for the creation of a federal district under exclusive jurisdiction of the U.S. Congress.

From Wikipedia