On Nov. 9, 1989, East German border guards opened the Berlin Wall and changed the trajectory of history. The fall of the wall marked the beginning of the end of the Cold War. It was also a moment of hope and possibility. Even before the wall came down, Soviet leader Mikhail Gorbachev was making the case for a “common European home” in which the United States and the Soviet Union would both play a role, winning cautious praise from Western leaders. “I think we have come out of a period of cold war, even if there are still some chills and drafts,” Gorbachev said in June of 1989. “We are simply bound to a new stage of relations, one I would call the peaceful period in the development of international relations.”

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