One post-war fact about the united states that created tension wit the ussr was the united state

One big factor in the tension:  The United States had atomic bombs, while the Soviet Union did not.

Another factor:

Those were two specific factors.  Underneath it all was a bigger, philosophical issue:  The USA was committed to capitalism and democratic institutions of government.  The USSR was committed to communism and imposed authoritarian government.  The Cold War was mostly a tension between these worldviews.

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by 1890, the united states had by far the world's most productive economy. american industry produced twice as much as its closest competitor--britain. but the united states was not a great military or diplomatic power. its army numbered less than 30,000 troops, and its navy had only about 10,000 seamen. britain's army was five times the size of its american counterpart, and its navy was ten times bigger. the united states' military was small because the country was situated between two large oceans and was surrounded by weak or friendly nations. it faced no serious military threats and had little interest in asserting military power overseas.