How and why did the United states and the Soviet union stopped being allies?​

the U.S.-Soviet alliance of 1941-1945 was marked by a major degree of cooperation and was highly essential to securing the defeat of Nazi Germany. Both countries were leaning towards the same side against the Germans in World War II, however the Soviet Union and the United States have never trusted each other.

Explanation:

the decreasing neutrality of the u. s. in world war i

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i believe the answer is d.