That wasn't going to happen as the German navy had very little comprising a navy beyond of a fleet beyond U Boats.
Most people don't realize just how far the Germans were technological wise, in the type of weapon systems they either had in mind, were on the drawing boards or were actually being tested, to include biological and radiological warfare, with some vehicles designed to deliver such weapons to the U.S. (somewhat difficult at the time but not impossible) had they not been stopped cold- hence the fortunate, decisive outcome of the Normandy invasion!
Not to mention some of the technology sent to Japan- jet/rocket engine technology for example, that the U.S. and Britain were also developing but quite behind in application of which, some were used by Japan! Hitler made some asinine decisions quite often that fortunately for us and Britain, hampered production of his class of jet fighters (Messerschmitt ME 262). Had he used his head, he would have massed produced the jet that could have prevented bombing of his production facilities in the first place- and we won't get into his V1 flying bomb and V2 missile in production! and plans for his A4, A9, A9/A10, A4b and A4b/A10 missiles- some designed to hit the Eastern portion of the U.S.
I still stand by my comment, knowing what I understand about their capabilities! In this respect, if they had not been stopped and WWII had dragged on for a few more years, a large navy, wouldn't necessarily have been needed- only enough vessels, with enough personnel to affect an end to WWII.