What compels non-Americans to deny the obvious truth? I guess they are just idiots who don't study history. You need to read some more. The way Socialist ideas played out in the American and European context are widely different. For Europe socialist ideas more directly influenced government policies and parties. In the US the effect was most directly seen in the labor union movement. Many people credit the labor unions as a reason there was no large communist party in the US. Saying Socialist ideas had/have greater influence in Europe is just obvious.

https://en.wikipedia.org/wiki/Communists_in_the_United_State...