How did tensions increase between the USA and Soviet Union from 1917 to the start of the Truman Doctrine? I need to know which key events cause increased tensions between the usa and soviet union from 1917 to the start of the Truman Doctrine.

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The spread of communism and its plans for a world-wide revolution were definitely a factor; but one cannot discount the proliferation of nuclear weapons. There is substantial thinking among scholars that Truman ordered the bombing of Hiroshima and Nagasaki not so much to end the war quickly as to show the Soviets the muscle which the U.S. had, should they not back down. One must also not discount the paranoia of Joseph Stalin who told his people after the surrender of Germany, "the war against Fascism has ended; the war against capitalism has begun." It is doubtful that tensions would have escalated so swiftly were it not for nuclear proliferation and the Soviet determination to exterminate capitalism. Each side saw the other as a threat, and was determined to stop that threat in its place. 

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The first cause of the tension was the actual creation of the Soviet Union and the civil war that Russia went through during that creation.  As the Soviet Union was being created, the United States government opposed the Bolsheviks.  They condemned the Revolution and they sent a few troops to try to help defeat the communists.  This showed that the US really did not like the idea of a communist government and it helped make the USSR suspicious of the US.  After that, the US did not recognize the existence of the Soviet Union for over a decade.

The other major cause of tensions was the issue of how to split up Eastern Europe (and to some extent Asia) at the end of WWII.  This caused tension because the US thought the Soviets were overly expansionist and the Soviets thought the US was trying to encircle and destroy them.

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