Chapter XXXIII: Section III

1. New States may be admitted by Congress into this Union; but no new State shall be formed or erected within the jurisdiction of any other State, nor any State be formed by the junction of two or more States, or parts of States, without the consent of the legislatures of the States concerned, as well as of Congress.

2. Congress shall have power to dispose of, and make all needful rules and regulations respecting the territory, or other property belonging to the United States; and nothing in this Constitution shall be so construed as to prejudice any claims of the United States or of any particular State.