In fact, at the end of war, the XXI was the base for new generation of submarines for USA, UK, Russia and France, the actual leaders in nuclear submarine technology
US WWII submarine concept was abandoned as soon as war ended, and as soon as they could have a XXI.
Before XXI, both conception (german and US) was quite close, even if also quite different.
But the born of the modern submarine concept start with XXI.
If german had XXI from 1942, the atlantic battle should have been very different.
A chance they couldn't built it at this time !
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