Well it helped that the US didn’t get the crap bombed out of it, like the other warring nations.
Yes, and we were right to think “ugh...after the FIRST World War and the Europeans are at it (mutual self-destruction) AGAIN?”
Though over here you had people going hurrah-hurrah about the Russian Revolution and socialism particularly during the Great Depression and even some Nazi sympathizers.
But most everyone else was isolationist by nature. WHY GET INVOLVED.