The Cold War has gone, what do you think about the reasons it happened?

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The Cold War has gone for 17 years. All of these days People couldn't understand why the very powerful and strong Soviet Union callapsed one night. It is beyond all expectations that the Soviet Union disappeared on the earth.Differend people have different opinions.For example, Gorbachev's reforms, the arms race between the Soviet Union snd the U.S.A and the peaceful evolution stretegy of the U.S.A. What do you think about the problem? What do you think the important reasons is?