What was the underlying cause of the cold war?

The causes of the Cold War were rooted in the failure of the Allies (U.S., Great Britain, U.S.S.R.) to reach common peace agreements with regard to Germany and Poland at the Yalta and Potsdam Conferences. ... As a result, the Cold War polarization between the U.S. and the Soviet Union lasted for almost 50 years.

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answer; ///i believe that the correct answer is (b); ///the candidate must be a native born american citzen;

the indians crossed artificial boundaries, setting the stage for conflict