>>We had a lot of isolationists.
Being isolationist makes sense when you:
a) Live in a nation that spans a continent and has just about anything you need and is protected by oceans.
b) Are nation of people who left European squabbles behind on purpose!
c) Recognize that there were no good guys in Europe (it was Nationalist Socialists vs Internationalist Socialists vs Monarchists).
Your point “b” makes me think of people like my great grandmother who immigrated here from Norway then ended up having 4 of her American born sons drafted to fight a European war. Even moving half a world away wasn’t enough.
My mom said Grandma H. was absolutely set against socialism and fired many letters off to FDR warning him of its evils. Different times!