The most accurate response is:
The U.S. based its systems on democracy and capitalism, while Soviet-aligned states based theirs on communism.
This choice correctly identifies the political and economic systems of both the U.S. and the Soviet-aligned states after World War II. The U.S. embraced a democratic government and a capitalist economic model, whereas the Soviet Union and its satellite states implemented a communist framework that emphasized state control of the economy and a single-party political system.