And the Midwest is full of ex-Germans. No chance of America joining the Entente.
Maybe I missed something but how is the British blockade policy different ITTL than IOTL? (IIRC it was also British policy IOTL to stop and inspect neutral ships bound to neutral countries bordering the North Sea like Sweden and the Netherlands so as to prevent material from being reexported to Germany.) The British blockade didn't poison US relations with Britain or keep Americans from being willing to eventually fight alongside the Entente IOTL so why would it have that effect ITTL?