Prime Minister of Rhodesia held the post until the end of Federation on 31 December 1963. When Northern Rhodesia gained independence as Zambia on 24 October 1964, Southern Rhodesia began to refer to itself simply as "Rhodesia". Prime Minister Ian Smith's government issued a Unilateral Declaration of Independence from Britain in 1965, and he remained Prime Minister when the country was declared a republic in 1970. Under the Internal Settlement in 1979, after a long period of conflict, the country became known as Zimbabwe-Rhodesia, with Abel Muzorewa as its first black Prime Minister. None of these acts were recognised internationally, and under the Lancaster
Southern Rhodesia which was situated on the Southern Rhodesian side of the Zambezi Gorge. This situation caused some embarrassment for the Zambian government later when it was a "front line state" in support of insurgents into Rhodesia in that its major source of electric power was controlled by the Rhodesian state. With the protectorate of Northern Rhodesia no longer in existence, in 1964 Southern Rhodesia reverted to the name "Rhodesia" (see next section). In 1965, Rhodesia unilaterally declared itself independent under a white-dominated government led by Ian Smith. After a long civil war between the white (until 1979) government and two African