The document discusses the Berlin Wall and Cold War crisis. The Berlin Wall separated East and West Berlin for decades until its destruction in 1989, symbolizing the reunification of Germany and the end of the Cold War. President Kennedy said "let them come to Berlin" to assert America's commitment to West Berlin. President Reagan later called on Soviet leader Gorbachev to open the Brandenburg Gate and tear down the Berlin Wall, which eventually happened in 1989, allowing reunification for all Germans.