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Originally Posted by Respenus
Let us not mistake it; the XXI was a major innovation, but it was more important to the Soviets, who used it's design well into the production of the Soviet nuclear fleet, than the Americans, who switched designs early in SSN development.
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All allies had one copy of the XXI
and all allies, after the war, built their new submarine generation from it, USA included.
There is nothing to compare beetween US submarines before and after the end of the war for that reason.
USA didn't found themself this kind of concept, they used the german technology.
Not only in that subject and not only the USA, of course.