Uniform Title Memorandum of Understanding between the Government of the United States of America and the Government of the Republic of El Salvador Concerning the Imposition of Import Restrictions on Categories of Archaeological and Ethnological Material of the Republic of El Salvador (2020 March 3) Title Cultural exchanges, property, and cooperation : import restrictions : memorandum of understanding between the United States of America and El Salvador, signed at San Salvador, March 3, 2020; entered into force March 3, 2020.