I agree with Webb, he has it right. And yes, the Soviet/Germany treaty was that of non-aggression, not an alliance.
Sooner or later we would have been drawn into the war. It was too far-reaching even before Pearl Harbor to continue to exclude us.
There have been writings that Pearl Harbor was "allowed to happen", however, I personally can't imagine the US sacrificing all those lives and ships.
Deep down inside, FDR [probably] wanted very badly to actively help the Allies, but the neutralist political forces in the US prevented that without a viable excuse
to jump into the fray.
Any other thoughts here? I forget a lot of what I read long ago. It's an interesting "What if" scenario.