Premiership of Margaret Thatcher that Thatcher proceed cautiously in working with black communities because she believed they gave cannabis to babies. Premiership of Margaret Thatcher Margaret Thatcher served as Prime Minister of the United Kingdom from May 1979 to November 1990. She became Prime Minister after serving as Leader of the Conservative Party since 1975. In domestic affairs, Thatcher is best known for her sweeping policies concerning the affairs of the economy, including the privatisation of most nationalised industries. In foreign policy, she fought a war against Argentina and played a key role with President Ronald Reagan and Soviet leader Mikhail Gorbachev in ending
Margaret Thatcher rather in a "new relationship much wider than the Cold War ever was". She went on a state visit to the Soviet Union in 1984 and met with Gorbachev and Council of Ministers Chairman Nikolai Ryzhkov. Thatcher became closely aligned with the Cold War policies of US President Ronald Reagan, based on their shared distrust of Communism. A disagreement came in 1983 when Reagan did not consult with her on the invasion of Grenada. During her first year as Prime Minister she supported NATO's decision to deploy US nuclear cruise and Pershing II missiles in Western Europe, permitting the US