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Yalta conference is held in Soviet territory. The cold war begins.
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The Soviets blocked off all land, rail, and water routes into West Berlin. Berlins 2 million residents were no longer able to import food, coal, and other vital supplies.
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The Soviet Union tests an atomic bomb.
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Because of the success of the Soviets atomic bomb the United States decided to make a weapon even more lethal. They were successful.
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The Soviet Union and the communist nations of Eastern Europe formed their own alliance known as the Warsaw pact.
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The Soviet Union successfully launches history's first artificial satellite.
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The INF treaty or the Intermediate-Range Nuclear Forces Treaty was ratified. This treaty called for the elimination of certain types of missiles.
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Hungary opens its border with Austria which causes thousands of East Germans to travel to Hungary.
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Overjoyed Berliners began tearing down the wall.
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Many of the countries that the Soviet Union consisted of declared independence, which led to the fall of the Soviet Union