Uniform Title Memorandum of Understanding between the Government of the United States of America and the Government of the Federal Republic of Nigeria Concerning the Imposition of Import Restrictions on Categories of Archaeological and Ethnological Material of Nigeria (2022 January 20) Title Cultural exchanges, property, and cooperation : import restrictions : memorandum of understanding between the United States of America and Nigeria signed at Abuja, January 20, 2022; entered into force January 20, 2022.