Margaret Thatcher was one of the most important political figures of the 20th Century. She was a British politician. Daughter of a grocer, she went on to become the leader of the conservative party from 1975 to 1990. She was the first female Prime Minister of the United Kingdom and served from 1979 to 1990. She was also known as the "Iron Lady". She led Britain in the Falklands war, and during her tenure she reshaped almost every aspect of British politics, reviving the economy, reforming outdated institutions, and reinvigorating the nation's foreign policy.