The USA was neutral.
Ignoramus.
Not really if you consider Roosevelt's pledge to be the “Arsenal of Democracy”, Lend Lease, and the U.S. institution of its first-ever peacetime draft.
The U.S. initially did hope to stay out of Europe's fratricide but by the late 30’s recognized it would have to straighten that mess out again. That's probably why the bad guys attacked the U.S.