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Timeline: Conflict and tension between East and West, 1945–1972

The tension between the two superpowers, the United States of America (USA) and the (USSR) initially grew from differences between the two: the Soviet Union was and its political and economic systems were at odds with those of the USA which were .

Despite their differences, the USA and USSR were able to join together in an uneasy wartime alliance against during World War Two. However, once the war was won, this wartime alliance began to fall apart and the ideological differences between the two developed into outright hostility.