22 U.S.C. § 277d–38

Land acquired or to be acquired by the United States of America in accordance with the provisions of the treaty, including the tract provided for in section 277d–39 of this title , shall become a geographical part of the State to which it attaches and shall be under the civil and criminal jurisdiction of such State, without affecting the ownership of such land. The addition of land and the ceding of jurisdiction to a State shall take effect upon acceptance by such State.