Former British Prime Minister Margaret Thatcher has died from a stroke at the age of 87. Thatcher who served from 1979 to 1980 was known as the "Iron Lady" for her personal and political toughness.

Prime Minister David Cameron expressed his sadness, saying "we have lost a great leader, a great prime minister and a great Briton."

Thatcher, the country's first female prime minister, re-made Britain's economic landscape after coming into office in 1979 with a free-market philosophy and the goal of privatizing state industries. And she would wage some hard-nosed battles with the country's labor unions.

Thatcher's forceful personality and hard-driving style earned her the nickname of the "Iron Lady." It was a term that was reinforced when she led Britain into war against Argentina in 1982 after the Argentines invaded the Falkland Islands. She forced them to retreat.