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Almost instantly after the end of World War II there was disagreements between the United States and the Soviet Union leaded to the so called Cold War
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Winston Churchill delivers his famous Iron Curtain speech in which he states "an iron curtain has descended on Europe..." referring to the Berlin Wall and secretive communist practices
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The USSR conducts their first atomic bomb test code named RDS-1 at the Semipalatinsk test site in Kazakhstan
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Truman approved order approving the full development of hydrogen bombs for production and delivery
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The arms race between the United States and Soviet Union intensifies as U.S. carries out 11 explosions at Nevada test site
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Suez Crisis begins with an Israeli attack on Egyptian forces
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Soviet Union launches the Vostok rocket designed for the human spaceflight program. Vostok was the first artificial satellite and the first crewed spacecraft in human history.
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Sputnik was the first orbiting satellite launched in human history
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Cuba is taken over by dictator Fidel Castro, alarming the United States with an opposing communist nation so close (https://www.history.com/topics/cold-war/fidel-castro)
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The Cuban Missile Crisis began when the Soviet Union began installing nuclear missiles in Cuba. The United States wouldn't let them and after many tense days of negotiating the Soviet Union agreed to remove them
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The Nuclear Test Ban Treaty states that nuclear weapon testing cannot be conducted on the ground, in the atmosphere, in outer space, or underwater. Nuclear weapons can only be tested underground and all radioactive debris must stay in the countries borders
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200,000 men were sent to Vietnam, fighting against North Vietnam to stop the spread of communism
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The United States Apollo 11 is the first manned spacecraft to land on and return from the moon, winning the space race against the Soviet Union
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At the signing of the Paris Peace Accords America states that they will withdraw all troops from Vietnam and both sides agree to cease fighting in Laos and Cambodia
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President Regan and Mikhail Gorbachev agree to remove all intermediate nuclear missiles from Europe in intermediate-range nuclear forces treaty
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The Berlin Wall was demolished and people were allowed unrestricted migration