Margaret Thatcher, known as the "Iron Lady," served as the Prime Minister of the United Kingdom from 1979 to 1990. She earned this nickname due to her strong-willed, uncompromising stance on a range of political and economic issues, particularly her conservative policies advocating for deregulation, privatization of state-owned industries, and reducing the power of labor unions. Her leadership style and policies transformed British politics and economics, sparking significant changes, including economic recovery during a time of recession. While she garnered both praise and criticism for her policies, her impact as a leader solidified her place in British political history.