Brian Mulroney Liberals had a large majority due to their previous long tenure in power. Led by Allan MacEachen, the Senate took a very assertive role in legislation, forcing the government to compromise on several points despite its considerable House majority. A major undertaking by Mulroney's government was an attempt to resolve the divisive issue of national unity. Quebec was the only province that did not sign the new Canadian constitution negotiated by Prime Minister Pierre Trudeau in 1982, and Mulroney wanted to include Quebec in a new agreement with the rest of Canada. In 1987, he negotiated the Meech Lake Accord
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