Angola, officially the Republic of Angola, is a country on the west coast of Southern Africa. It is the seventh-largest country in Africa, bordered by Namibia to the south, the Democratic Republic of the Congo to the north, Zambia to the east, and the Atlantic Ocean to the west. Angola has an exclave province, the province of Cabinda that borders the Republic of the Congo and the Democratic Republic of the Congo. The capital and largest city of Angola is Luanda. The territory of Angola has been inhabited since the Paleolithic Era, hosting a wide variety of ethnic groups, tribes and kingdoms. The nation state of Angola originated from Portuguese colonisation, which initially began with coastal settlements and trading posts founded in the 16th century. After a protracted anti-colonial struggle, independence was achieved in 1975 as the Marxist–Leninist People's Republic of Angola, a one-party state supported by the Soviet Union and Cuba. The civil war between the ruling People's Movement for the Liberation of Angola (MPLA) and the insurgent anti-communist National Union for the Total Independence of Angola (UNITA), supported by the United States and apartheid South Africa, lasted until 2002. The sovereign state has since become a relatively stable unitary, presidential constitutional republic.