Article 1, Section 8, Clause 17
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, and to exercise like Authority over all Places purchased by the Consent of the Legislature of the State in which the Same shall be, for the Erection of Forts, Magazines, Arsenals, dock-Yards, and other needful Buildings;
This clause means that the Federal government has no legislative authority outside of the District of Columbia and the territories of the united States.
Acquistion of state land by the Federal Government
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