As a general rule, the USA, starting out as a European colony, got most of its ideas from Europe.

However, after the WWII destruction of Europe,
its US and USSR occupiers (and their European stooges)
literally outlawed many of the competing ideas/ideals/ideologies in Europe.

Basically, the same thing that was done to European Art was done to European Ideas.

Ugliness, stupidity and primitivism were now the only allowed/promoted movements
and anything classical/European was to be despised.

To become a celebrated artist or thinker in occupied Europe,
you had to abide by the new rules ...
something that, unfortunately, is still going on.