What event lead to the former alliance between the soviet union and the united states to unravel? the death of fdr and truman replacing him the differences in how the war affected each nation, with the us having less destruction and casualties compared to the soviet union the anger between the two nations over stalin's non-aggression pact with hitler and the lack of us involvement in the war in europe all of the above

The differences in how the war affected each nation, with the US having less destruction and casualties compared to the Soviet Union is your best answer.

Another reason is the fact that they used two seperate types of government, and each tries to impose it's own kind on other countries in an effort to be able to be the "leader of the world".

hope this helps

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