If Hitler had waited till the U-Boaft Fleet was complete....perhaps all this other talk would be moot.
He almost won as it was but lost the Naval War due to having far too few Subs at the start.
Llkewise.....had FDR not violated the Neutrality Act....by providing resources, ships, tanks, and other armaments, and naval units for escorts.....the outcome of the early part of the War would have been altered as well.
Consider Hitler could have not declared War on the United States and probably we would have been delayed further from getting involved.