Also no US entry which means its worse for everyone, war might last to 46 (Nazis lose).
Actually Hitler will still be faced with the same choice as IOTL. He can declare on the U.S. or he can abandon the Battle of the Atlantic.
As soon as Congress declares war on Japan, FDR has the right, actually the obligation, to provide protection to all U.S. flagged ships (and since the UK is now a co-belligerent, arguably UK/Commonwealth flagged vessels as well) from Japanese attack.
"There is no way for the USN to determine if a submerged submarine is German or Japanese, so a complete exclusion zone around U.S. flagged convoys is announced. The U.S. will, of course, refrain from attacking any German submarine, provided it does not attack an American flagged vessel, once it surfaces and identifies itself since the U.S. has friendly relations with the 3rd Reich.
The U.S. can not, of course, give any assurances regarding RN or RCN vessels in the same convoy. The U.S. can also not take for granted that any
submerged submarine is actually a KM boat, an IJN submarine might be lurking in the area, just awaiting the opportunity to attack (the Japanese have already clearly demonstrated their villainy, and a surprisingly wide reach, so prudence is the only acceptable course). So once it identifies itself, any U-Boat is free to conduct attacks, on the
surface provided no U.S. vessels are targeted. Many of those U.S. vessels are, of course, carrying war supplies and/or troops to the UK. The British are our allies against Japan, and providing them with war supplies and sending troops to train with the more experience British forces, all for use against Japan, of course, is to be expected.
Of course we understand your concerns Chancellor Hitler, but we have the strongest of assurance that the materials will only be used against Japan."
End of the Battle of the Atlantic. End of any hope of forcing the British out of the war.
Perfect situation for the Americans