Commons:Copyright rules by territory/American Samoa
Under the 1899 Tripartite Convention Germany and the United States partitioned the Samoan Islands. Germany took the larger islands to the west, now Samoa, while the United States took the smaller eastern island group, known as the Tutuila Islands in 1900 and officially Manu'a in 1904. The United States formally annexed the islands in 1902, and in 1911 renamed them American Samoa. American Samoa became self-governing under a constitution effective from 1 July 1967, but is on the United Nations list of Non-Self-Governing Territories.
As American Samoa is an unincorporated territory of the United States, many U.S. federal laws apply. It seems reasonable to assume that this includes copyright laws.