The Cold War

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…Soviet Union in several countries, especially Hungary, Poland, and Czechoslovakia. In 1956, the Soviet troops quickly put down an uprising in Hungary, and in 1968 Warsaw Pact troops were sent into Czechoslovakia after that nation's government began to lift restraints on personal freedom. Soviet troops were withdrawn from Hungary, Poland, and Czechoslovakia in 1990, in accordance with Gorbachev's reform policies. The Warsaw Pact's military structure disbanded on March 31, 1991 and the political arm agreed to disband three months later.