What was the cold war, and what major disagreement led to it? when did the cold war end

The Cold War was a state of geopolitical tension after World War II between powers in the Eastern Bloc (the Soviet Union and its satellite states) and powers in the Western Bloc (the United States, its NATO allies and others).

The Cold War ended in 1991

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The Cold War was not technically a war. No fighting was involved, however, it lead to lots of tension between the U.S. and the Soviet Union. Both countries basically worked towards building more nuclear weapons than the other. This was a way to prove that if one country fired the weapons, the other could retaliate. The Cold War ended in 1991.