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how did the united states and the soviet union go from allies during the second world war to enemies engaged in a cold war?

The reason that the United States And the Soviet Union went to war after the second world war is because the United States were nervous about the Soviets communist way of life. The United States did not want communism to spread and they saw that it was spreading to different parts of the world. The Soviet Union despised the way Americans lived as well so they went to war.

Population growth is one way