Answer:
The Potsdam Conference is perhaps best known for President Truman's July 24, 1945 conversation with Stalin, during which time the President informed the Soviet leader that the United States had successfully detonated the first atomic bomb on July 16, 1945.
Napoleon's impact on the French economy was of modest importance in the long run. He did sweep away the old guilds and monopolies and trade restrictions. ... This had the effect of encouraging innovation in Britain, where the Industrial Revolution was well underway, and diverting the need for innovation in France.
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President Reagan "sign" refers to the removal of barriers that divided East and West Berlin, Germany. In his speech made in West Berlin on 12th June 1987, the U.S President Ronald Reagan asked the leaders of Sovie Union to open up the barrier that divided East and West Berlin in his speech "Tear down this wall"