If there had been the number of U-Boats that Donitiz had wanted (300) I think England would have been in deep trouble, regardless of what type of boat they were. It would have cut the supplies that Britain depended apon to survive, let alone fight with.
If England had fallen, would had America gone to war with Germany? Unkown, It would have been very hard to fight the German's from such a great distance. Even though F.D.R wanted to fight with England from an early stage, political will was against it. There was also strong support for Germany in Amercia, with such groups as the Bund, openly behind Hitler. Many people thought that this war wasn't for them, and prefered that American stay neutral.
The Bombing of Peal Harbour changed that view. So it's just a case of "what if"
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