Martin Brian Mulroney, PC, CC, GOQ, lawyer, businessman, politician, prime minister of Canada 1984 to 1993 (born 20 March 1939 in Baie-Comeau, QC). Former Progressive Conservative Party leader Brian Mulroney helped his party win the most seats ever (211) in the 1984 election. As prime minister, he signed a landmark free trade deal with the United States and Mexico (NAFTA) and oversaw passage of the unpopular Goods and Services Tax (GST). He also spent much political capital trying unsuccessfully to persuade Quebec to sign the Constitution. (See Meech Lake Accord; Charlottetown Accord.) Mulroney took a strong stance against apartheid and made great strides in protecting the environment. But his historically low popularity led to an unprecedented defeat in 1993, which sent the Conservative Party into disarray for a decade.