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 other British territories were fixed by Orders-in Council. The border between the British Central Africa Protectorate and North-Eastern Rhodesia was fixed in 1891 at the drainage divide between Lake Malawi and the Luangwa River, and that between North-Western Rhodesia and Southern Rhodesia became the Zambezi River in 1898. The area of what became Northern Rhodesia, including Barotseland and land as far as Nyasaland to the east and to Katanga and Lake Tanganyika to the north, was placed under BSAC administration by an Order-in-Council of 9 May 1891, but no BSAC Administrator was sent to Barotseland until 1895, and the first