Margaret Thatcher was not a film actor; she was the first female Prime Minister of the United Kingdom, serving from 1979 to 1990. Known as the "Iron Lady," she was a leader of the Conservative Party and implemented significant economic reforms, emphasizing deregulation, privatization, and a reduction in the power of trade unions. Her tenure was marked by strong leadership during the Cold War and the Falklands War. She remains a polarizing figure in British politics and history.