[icwhatudo]

So the question is what would have happened if Germany and Italy had not declared war on the US. Would we have concentrated only on Japan and simply continued lend/lease?

[HenpeckedCon]

“So the question is what would have happened if Germany and Italy had not declared war on the US?”

No, the US would have declared war on Germany and Italy. Roosevelt figured (correctly) that the idiot Hitler would declare war on the US and take him off the hook with a potential fight with congress. It was Germany's only declaration of war during the entire war.