What factors led the wartime alliance between the united states and the soviet union to disintegrate into the cold war?

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The common enemy, which was Nazism, was the main motivator for the union of the USA and the USSR. There was, however, no continuity in this alliance and, shortly after the end of the war, Germany taken was divided between the allies and a strong opposition to socialism, by its model to deny the international market, began to rise, generating two large Which would result in the Cold War.
 

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Upheld the 1st amendment according to the u.s constitution. freedom of speech being limited in this case yes national emergencies