The US stood alone and enacted socialist ideas? You have heard of the USSR, haven't you? If the US was enacting socialist ideas it definitely wasn't alone in doing so.

Next I wonder what "a lot of socialist ideas" were. The New Deal during the Great depression was fairly socialist with the government making up work it could pay people to do and such, but I'm pretty sure after WWII is when anti-socialist (anti-Soviet) sentiment peaked in the US