Primarily, the The Soviet Union was responsible for the Cold War. The Soviet Union caused unrest in Europe and stepped out of line in its alliance with the victors.
The Soviet Union was primarily responsible for the Cold War because they stepped out of line in its alliance with the victors. Soviet Union's greed ultimately started the war and can be seen as the main cause of the Cold War.
Therefore, the causer of the Cold War is the Soviet Union.
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