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;--

1.William Blackstone, Commentaries 1:255, 1765
2.Records of the Federal Convention
3.James Madison, Federalist, no. 43, 288--90, 23 Jan. 1788
4.Debate in Massachusetts Ratifying Convention, 24 Jan. 1788
5.Federal Farmer, no. 18, 25 Jan. 1788
6.Debate in Virginia Ratifying Convention, 6, 16 June 1788
7.Thomas Tredwell, New York Ratifying Convention, 2 July 1788
8.Debate in North Carolina Ratifying Convention, 30 July 1788
9.Samuel Adams to Elbridge Gerry, 22 Aug. 1789
10.James Madison, Location of Capital, House of Representatives, 4, 21 Sept. 1789
11.St. George Tucker, Blackstone's Commentaries 1:App. 276--78, 1803
12.Hepburn v. Ellzey
13.United States v. More
14.Commonwealth v. Clary
15.Custis v. Lane
16.United States v. Cornell
17.People v. Godfrey
18.Loughborough v. Blake
19.Cohens v. Virginia
20.William Wirt, Right to Tax Government Property, 8 Sept. 1823
21.American Insurance Co. v. Canter
22.Joseph Story, Commentaries on the Constitution 3:§§ 1212--22, 1833