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
Third Thatcher ministry Inflation, which the first Thatcher government had conquered by 1983, was touching 10% for the first time in eight years. Then, on 1 November 1990, came the first of a series of events which would spell the end of Margaret Thatcher's years in power. Sir Geoffrey Howe, the deputy prime minister, long resentful of being ousted as Foreign Secretary, resigned from the cabinet over its European policy. Soon afterward, in his resignation speech in the House of Commons, he publicly denounced Thatcher, having once been one of her closest allies, personally and for her hostility towards the programmes of the