Third Thatcher ministry to make way for a leader more likely to win the next general election. Her successor was the Chancellor of the Exchequer John Major, who was elected on 27 November 1990, and who at 47 became the youngest Conservative Prime Minister of the 20th century. <section begin="June 1987 to July 1989" /> <section begin="July 1989 to November 1990" /> Members of the Cabinet are in bold face. Third Thatcher ministry Margaret Thatcher was Prime Minister of the United Kingdom from 4 May 1979 to 28 November 1990, during which time she led a Conservative government. She was the first woman
Premiership of Margaret Thatcher war and defeated Argentina to recover the Falkland Islands. She was a leader in the coalition against Iraq's invasion of Kuwait. She developed an excellent relationship with U.S. President Ronald Reagan. Since the death of Margaret Thatcher in 2013, several government documents relating to her premiership have been declassified and released by the National Archives. Papers released in December 2014 show that Thatcher completely disapproved of GCSEs which, in 1986, Sir Keith Joseph was trying to introduce in the face of fierce opposition from teaching unions. At very least she wanted a 2-year delay to ensure rigorous syllabuses and adequate