Was post-war anti-communism ginned up as a device to support "We're Number One" as a FP goal?

FP=foreign policy.

... partially as a means to justify primacy, and this culture, in turn, helped shape the ideology of generations of Americans.

— Daniel Bessner (@dbessner) December 9, 2018

...whereas your research suggests it was an ex post facto justification for American supremacy.

— David Walsh (@DavidAstinWalsh) December 9, 2018