Explain what was the order of events that led to the end of the Cold War between the United States and the Union of Soviet Socialist Republics?

Ronald Reagan and the End of the Cold War: The Debate Continues:
http://www.gilderlehrman.org/history-by-era/age-reagan/essays/ronald-reagan-and-end-cold-war-debate-continues

According to the author of this article what was the order of events that led to the end of the Cold War between the United States and the Union of Soviet Socialist Republics? What specific changes to the foreign policy of the Reagan Administration occurred to encourage an end to the Cold War?

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