What were the philosophical differences between the soviet union and the united states?

The USSR (Soviet Union) was predominantly communist, with a totalitarian government (basically, there was no democracy; it was a dictatorship). While, on the other hand, the USA (United States) remained as a capitalist country with a democratic government.
The Soviet Union was controlled/manipulated by local communist parties and by a Supreme Soviet. On the opposite side of the spectrum, the United States was governed by two political parties (Republican/Conservative and Democratic/Liberal).

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River valleys were good places for hunting and fishing.

The answer to the question is a.