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The construction of Berlin Wall started. Some democratic Germans rush into the West Berlin. The United States announce that will try them best to help the West Berlin. (https://www.history.com/topics/cold-war/berlin-wall)
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The Soviet Union deployed missiles in Cuba. The United States force the Soviet Union retreat the missiles in order to quiet down this event. (https://history.state.gov/milestones/1961-1968/cuban-missile-crisis)
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President Johnson approve the Operation Rolling Thunder. They started to attack the North Vietnam. (https://en.m.wikipedia.org/wiki/Vietnam_War)
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It was a period of political liberalization in Czechoslovakia as a communist state. (https://en.m.wikipedia.org/wiki/Prague_Spring)
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President Richard Nixon promises to remove all US troops from South Vietnam. It means the United States try to stop the war.(https://www.history.com/this-day-in-history/u-s-withdraws-from-vietnam)
