District of Columbia

"To exercise exclusive Legislation in all Cases whatsoever, over such District (not exceeding ten miles square) as may, by Cession of particular States, and the acceptance of Congress, become the Seat of the Government of the United States" (U.S. Const. Art. I, § 8). The U.S. Constitution, with this proclamation, left the legal formation of a national capital up to the U.S. Congress. To this day, the District of Columbia is neither a state nor a territory and remains under congressional jurisdiction.