McPherson
Banned
The German Kaiser's Secret Plan To Invade the U.S.The USN had actively sought to limit the size of its main competitors navies in Britain & Japan through the WNT & LNT, as well as sundering the Anglo-Japanese Treaty dead.
One major concern in 1940 was if Britain fell, what would happen to the major fleet units of the RN. There was a very real fear that it may be ceded or seized by Germany.
Now imagine the USA, by choice, approving to the handover of the RN to Hitler, thus leaving the Third Reich with a possible combination of the navies of Germany, France, Italy & Britain. Although probably the extreme situation, it would bring OTL Washington out in a cold sweat. And that's before the IJN are brought into the equation.
The USA had worldwide trading interests - look at the response to Japan's incursions into China. They would be worried not only at the potential loss of trade, but the threat any large navy would pose to their interests. They saw the RN - which, in their wildest moments, never contemplated an Anglo-American war - as such a rival: how do you think they would see a Kriegsmarine on steroids?
ONI found out about that one around 1906. How did it make the USN feel?