Angola in the 1950s transitioned from colonial to provincial status. Angola had the status of a Portuguese colony from 1655 until the Assembly of the Republic passed a law on June 11, 1951, giving all Portuguese colonies provincial status, effective on October 20, 1951. Separatist political organizations advocating Angolan independence formed in the 1950s despite strong resistance from the Portuguese government, leading to the Angolan War of Independence (1961–1975).