Samoa became the first pacific nation to gain independence in 1962, Fiji and Tonga became independent in 1970, with many other nations following in the 1970s and 1980s. The South Pacific Forum was founded in 1971, which became the Pacific Islands Forum in 2000. Bougainville Island, geographically part of the Solomon Islands archipelago but politically part of Papua New Guinea, tried unsuccessfully to become independent in 1975, and a civil war followed in the early 1990s, with it later being granted autonomy.