American Samoa | U.S. Department of the Interior

American Samoa became a U.S. territory by deed of cession, starting in 1900. The matai (local chiefs) of Tutuila, the largest island in American Samoa, ceded the island to the United States in 1900. Manu’a followed in 1904. Swain Island joined the territory in 1925 by an act of the Congress. Authority over American Samoa was initially placed with the U.S. Navy which oversaw the territory until …

: https://www.doi.gov/oia/islands/american-samoa