But the British are now being stretched out even further and unlike OTL, British and French don't have the Americans backing them up, so more problems for them and thus giving more advantage to the Germans, Austro-Hungarian empire folk, Bulgarians and Ottoman forces.I mean not really, if you have the US economy crashing due to lack of commerce and their navy being destroyed everything it leave port, I could see a pro-peace being elected.
Remember the US still practices some form of isolation and really weren't that affected by foreign interests. Plus, Roosevelt would be smart enough to try government intervention to keep the economy moving. Heck, expanding train roads and transportation given what was going on at the time makes sense.
When Russia goes out (either by Febuary or October Revolution), it's going to be an even more painful war of attrition for the British and French, especially since they're at a disadvantage compared to OTL.
That and I doubt the rest of the Americas would get invovled (most are kinda in their own messes) and even if so, I doubt they'd go against the Americans.