Cold War
Updated February 21, 2017 | Factmonster Staff ![]( "Updated by an Factmonster Editor on February 21, 2017")
The longest war in U.S. history involved not weapons and warfare but words and ideas. Beginning in 1945, this war was a struggle between the U.S. and the Soviet Union. The U.S. wanted to contain the spread of communist control. The Cold War ended in 1990 with the collapse of communism in the USSR.
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