; 22 U.S.C. 288 et seq. ), or in any agreement or treaty to which the United States is a party, including the agreement entitled Agreement Between the United Nations and the United States of America Regarding the Headquarters of the United Nations , signed June 26, 1947 ( 22 U.S.C. 287 note), and the Convention on Privileges and Immunities of the United Nations, entered into force with respect to the United States on April 29, 1970 (21 UST 1418; TIAS 6900