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
Margaret Thatcher as a possible future Prime Minister. The description helped Thatcher meet with prominent persons during a busy itinerary focused on economic issues, including Paul Samuelson, Walt Rostow, Pierre-Paul Schweitzer and Nelson Rockefeller. Following the visit, Heath appointed Thatcher to the Shadow Cabinet as Fuel and Power spokesman. Prior to the 1970 general election, she was promoted to Shadow Transport spokesman and later to Education. In 1968 Enoch Powell delivered his "Rivers of Blood" speech in which he strongly criticised Commonwealth immigration to the United Kingdom and the then-proposed Race Relations Bill. When Heath telephoned Thatcher to inform her that he