Would not have mattered if it was the XXI or VII series boats, Numbers at the beginning would have made a huge difference. If Hitler would have sided fully with Dornitz and embraced the subs instead of siding with the Surface fleet admirals, vaste resources that were wasted on the Bismark and Turpiz, could have raised the number of uboats ready for sea to 200-300 by Sept 1939. By closing the gaps that they could not in reality with 50-60 boats. The British would have been starved for supplies by 1940. With little oil getting through, the Battle of Britian would have been won and Operation "Sea Lion" would have gone ahead. By the end of 1941 England would have surrendered or been close to it.
As for The US the line of thinking at the time was it's a european affair and we need not get involved. Plus Hitler was no fool, he would have done or said anything to delay the US getting involved as long as possible.
One small decision on who to back with resources could have made things quite differant indeed.
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