Southern Rhodesia's Prime Minister Ian Smith unilaterally declares the colony independent as the unrecognised state of Rhodesia.

Southern Rhodesia was a self-governing British Crown colony in Southern Africa, established in 1923 and consisting of British South Africa Company (BSAC) territories lying south of the Zambezi River. The region was informally known as South Zambesia until annexation by Britain, at the behest of Cecil Rhodes' British South Africa Company. The bounding territories were Bechuanaland (Botswana), Northern Rhodesia (Zambia), Portuguese Mozambique (Mozambique) and the Transvaal Republic. Since 1980, the colony's territory is the independent nation of Zimbabwe.

Ian Douglas Smith was a Rhodesian politician, farmer, and fighter pilot who served as Prime Minister of Rhodesia from 1964 to 1979. He was the country's first leader to be born and raised in Rhodesia, and led the predominantly white government that unilaterally declared independence from the United Kingdom in November 1965 in opposition to their demands for the implementation of majority rule as a condition for independence. His 15 years in power were defined by the country's international isolation and involvement in the Rhodesian Bush War, which pitted the Rhodesian Security Forces against the Soviet and Chinese-funded military wings of the Zimbabwe African National Union (ZANU) and Zimbabwe African People's Union (ZAPU).

Rhodesia's Unilateral Declaration of Independence (UDI) was a statement adopted by the Cabinet of Rhodesia on 11 November 1965, announcing that Rhodesia, a British crown colony in southern Africa that had governed itself since 1923, now regarded itself as an independent sovereign state. The culmination of a protracted dispute between the British and Rhodesian governments regarding the terms under which the latter could become fully independent, it was the first unilateral break from the United Kingdom by one of its colonies since the United States Declaration of Independence in 1776. The UK, the Commonwealth, and the United Nations all deemed Rhodesia's UDI illegal, and economic sanctions, the first in the UN's history, were imposed on the breakaway colony. With the help of the Commonwealth Secretariat, members of the Commonwealth were able to cooperate and advise Rhodesian Africans on policy. Amid near-complete international isolation, Rhodesia continued as an unrecognised state with the assistance of South Africa and Portugal.