Margaret Thatcher was the Prime Minister of which country?

Margaret Hilda Thatcher, Baroness Thatcher, LG, OM, DStJ, PC, FRS, HonFRSC (née Roberts; 13 October 1925 – 8 April 2013) was a British stateswoman who served as Prime Minister of the United Kingdom from 1979 to 1990 and Leader of the Conservative Party from 1975 to 1990. She was the longest-serving British prime minister of the 20th century and the first woman to hold that office. A Soviet journalist dubbed her the "Iron Lady", a nickname that became associated with her uncompromising politics and leadership style. As prime minister, she implemented policies that became known as Thatcherism.

A polarising figure in British politics, Thatcher is nonetheless viewed favourably in historical rankings of British prime ministers. Her tenure constituted a realignment towards neoliberal policies in the United Kingdom, with debate over the complicated legacy attributed to Thatcherism persisting into the 21st century.