Answer:
The main ideology in the US is that the power is in the people, competition is encouraged, and people can own land as long as they have money. The main ideology in the Soviet Union is that the power is in the government, everyone gets a certain amount of food, land, money no matter how much money they have and are usually under strict control. Basically the main difference is the US claims to have everyone equal and the Soviet Union makes everyone equal (except for the government).
there ya go hope this helped
