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
Northern Rhodesia of further white minority governments in Africa, talk of amalgamation resumed. In 1927, the British government appointed the Hilton Young Commission on the possible closer union of the British territories in East and Central Africa. Its majority thought that Northern Rhodesia and Nyasaland should seek closer links with East Africa, but the minority report favoured linking these two territories with Southern Rhodesia on economic grounds. Even before the Commission's report was published, there were discussions between the Northern Rhodesian settlers and the Southern Rhodesian government on the terms of a total union of the two Rhodesias as a single colony.