Margaret Thatcher smiles in this file photo. In 1975, she became the first woman to head a major party in Britain when she was elected leader of the Conservative Party.
The Sino-British Joint Declaration, stating that the People's Republic of China would reclaim sovereignty over Hong Kong from the United Kingdom on July 1, 1997, is signed in Beijing by Zhao Ziyang and Margaret Thatcher in 1984.
Thatcher as she attends church near her official country residenceon her 60th birthday in 1985.
Thatcher and her husband, Denis, acknowledge the applause from the Conservative Party conference on the final day of the conference in 1985.
Thatcher meets with U.S. President Jimmy Carter in London.
Thatcher and President Ronald Reagan share a laugh during a meeting of the Allied leaders in New York in 1985.
Thatcher meets with Egypt's President Hosni Mubarak in 1985.
Thatcher takes the controls of a crane to place an inaugural block of marble in London on the city's largest office development adjoining Liverpool Street Station in 1986.
Thatcher poses with BBC personality Jimmy Savile. Savile was very popular and beloved during his lifetime, but his image was significantly tarnished after allegations of hundreds of cases of sex abuse surfaced after his death in 2011.
Reagan walks with Thatcher during the annual G7 Summit in Toronto in June 1988.
Thatcher and U.S. President George H.W. Bush shake hands in 1989.
British Prime Minister Margaret Thatcher points skyward as she receives a standing ovation at the Conservative Party Conference in 1989.
African National Congress leader Nelson Mandela is greeted by British Prime Minister Margaret Thatcher at 10 Downing Street in 1990 prior to their talks.
President George H.W. Bush presents Thatcher with the Presidential Medal of Freedom in 1991. The award is the highest U.S. honor a civilian can receive.
Former Conservative Prime Minister Margaret Thatcher sits alongside her cabinet members as she attends the Tory Party Conference in 1994.
Queen Elizabeth and Thatcher together enter Claridge's in London for a glittering dinner in 1995 to celebrate the former prime minister's 70th birthday.
Thatcher blows the candles on her birthday cake during the celebration of her 70th birthday in Washington in October 1995. At left is Mila Mulroney, wife of former Canadian Prime Minister Brian-Mulroney, and Nancy Reagan, wife of former President Ronald Reagan.
Thatcher arrives at The Queen's Free Chapel of St. George for the Garter service at Windsor castle in 1995.
Baroness Margaret Thatcher stands with her husband, Denis, in the door of her offices in 2000. Denis Thatcher died in 2003.
Thatcher pays her respects as the casket of former U.S. President Ronald Reagan lies in state in the rotunda of the United States Capitol in Washington in 2004.
Thatcher attends a service to commemorate the 25th anniversary of the liberation of the Falkland Islands from Argentine occupation by British forces in 2007.
A bronze statue of former British Prime Minister Margaret Thatcher is seen inside the Palace of Westminster, London, in 2007. Thatcher was the first living ex-prime minister to be honored in such a way by the Commons.
Britain's Prince Charles and former Prime Minister Margaret Thatcher pose with Chelsea pensioners Dorothy Hughes and Winifred Phillips as they attend the opening of a new infirmary at the Royal Hospital Chelsea in 2009.
Thatcher poses next to a portrait of herself, painted by Richard Stone, in 2009. The portrait was unveiled at 10 Downing Street.
Britain's Prime Minister David Cameron poses for a photograph with former Prime Minister Margaret Thatcher outside 10 Downing Street in 2010.
Thatcher arrives for a service of thanksgiving and re-dedication on Battle of Britain Sunday at Westminster Abbey in London in 2010.