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US President Ronald Reagan, commemorating the 750th anniversary of Berlin, addresses on June 12, 1987 the people of West Berlin at the base of the Brandenburg Gate, near the Berlin wall. Due to the amplification system being used, the President's words could also be heard on the Eastern (Communist-controlled) side of the wall. "Tear down this wall!" was the famous command from United States President Ronald Reagan to Soviet leader Mikhail Gorbachev to destroy the Berlin Wall. The address Reagan delivered that day is considered by many to have affirmed the beginning of the end of the Cold War and the fall of communism. On Nov. 9-11, 1989, the people of a free Berlin tore down that wall. West German Chancellor Helmut Kohl is 3rd-right. AFP PHOTO MIKE SARGENT (Photo credit should read MIKE SARGENT/AFP/Getty Images)

US President Ronald Reagan, commemorating the 750th anniversary of Berlin, addresses on June 12, 1987 the people of West Berlin at the base of the Brandenburg Gate, near the Berlin wall. Due to the amplification system being used, the President's words could also be heard on the Eastern (Communist-controlled) side of the wall. "Tear down this wall!" was the famous command from United States President Ronald Reagan to Soviet leader Mikhail Gorbachev to destroy the Berlin Wall. The address Reagan delivered that day is considered by many to have affirmed the beginning of the end of the Cold War and the fall of communism. On Nov. 9-11, 1989, the people of a free Berlin tore down that wall.   West German Chancellor Helmut Kohl is 3rd-right. AFP PHOTO MIKE SARGENT (Photo credit should read MIKE SARGENT/AFP/Getty Images)