Tanzania

The territory of present-day Tanzania contains some of the oldest evidence of human habitation anywhere in the world, with hominid remains at Olduvai Gorge and Laetoli dating back several million years. By the first millennium of the common era, Bantu-speaking agriculturalists had migrated into the interior, gradually displacing or absorbing earlier Cushitic and Khoisan populations. Along the Indian Ocean coast, a distinctive Swahili civilisation emerged from the interaction of African communities with Arab, Persian, and later Indian traders. City-states such as Kilwa, which flourished from the eleventh to the sixteenth centuries, grew wealthy on the export of gold, ivory, and slaves, and the offshore island of Zanzibar developed as one of the most important entrepots of the western Indian Ocean.

Portuguese navigators reached the coast in the late fifteenth century and held a fragile suzerainty over the Swahili towns until they were expelled in the late seventeenth and early eighteenth centuries by the Sultanate of Oman. Omani influence deepened through the nineteenth century, when Sultan Seyyid Said relocated his capital to Zanzibar in 1840 and presided over a clove economy and a vast caravan trade that pushed deep into the interior. Inland, polities such as the Hehe under Mkwawa and various Nyamwezi and Chagga chiefdoms consolidated regional power even as Arab and Swahili slavers crossed their territories.

European partition followed swiftly. In 1885 the German Empire claimed the mainland as German East Africa, suppressing the Abushiri revolt of 1888 and the much larger Maji Maji rebellion between 1905 and 1907 with great loss of African life. After Germany's defeat in the First World War, the territory passed to Britain in 1922 as the League of Nations mandate of Tanganyika, later a United Nations trust territory. Zanzibar, meanwhile, became a British protectorate in 1890 while retaining its sultan. Nationalist mobilisation accelerated after the Second World War under Julius Nyerere and the Tanganyika African National Union, leading to independence on 9 December 1961 and a republican constitution the following year.

Zanzibar gained independence on 10 December 1963, but the Arab-led sultanate was overthrown in the Zanzibar Revolution of January 1964. On 26 April 1964 the two states merged to form the United Republic of Tanzania. Under Nyerere the country pursued a one-party socialist programme codified in the Arusha Declaration of 1967, which nationalised major industries and promoted the ujamaa villagisation campaign. Tanzania played a prominent role in southern African liberation movements and went to war with Idi Amin's Uganda in 1978 and 1979, contributing decisively to his overthrow. Economic strain prompted gradual liberalisation under Nyerere's successor Ali Hassan Mwinyi from 1985.

Multiparty politics returned with constitutional amendments in 1992, and the first contested general elections were held in 1995. The ruling Chama Cha Mapinduzi, formed from the 1977 merger of TANU and the Zanzibari Afro-Shirazi Party, has won every subsequent national election, although its margins on Zanzibar have at times been narrow and contested. Successive presidents, including Benjamin Mkapa, Jakaya Kikwete, John Magufuli, and Samia Suluhu Hassan, who took office in March 2021 after Magufuli's death, have presided over rapid economic growth alongside intermittent restrictions on opposition activity. Tanzania today is a unitary presidential republic with a semi-autonomous government in Zanzibar, an active member of the African Union, the East African Community, and the Southern African Development Community.