i'm interested in how this mismatch plays out in the first year of the war, because for all the talk about resources all the copper in the world isn't much use if it is thrown away by poor performance on the battlefield.
I'll grant you that, but we would need to get more information on just when this alternate USA goes off the beaten track, as well as what their war aims are.
For instance, I would view 1914 as probably a bit too soon for this to happen, but then again, it's not likely to happen in the first place, so...
The US is never going to be as militarily weak as they are in 1914 at any later wartime/war entry date, while at the same time the war will look nothing like historically.
A 1915 POD seems a bit more doable, as the effects of the war on the US economy is starting to be felt, and there is time enough for a few things to lead to the divergence from OTL, and at least the 1914 parts of the war may be not too different from historically.
A 1916 POD seems more likely/less unlikely, as the matter is still in doubt, especially with Jutland and the Deutschland arriving in the USA taking place as OTL. Jutland tells us the Germans are still in it, and the Deutschland tells us that trade can be had with Germany, despite the blockade.
A 1917 POD seems a bit less likely, but still doable, as both sides have been at it for awhile, and are fully committed to the war effort, and the USA is just about as ready as she will ever be to jump in.
A 1918 POD seems too me to be a bit to late, but there is still some fight left in the Germans, so...
The other thing to work out is, just what is the USA doing in the Central Powers?!?! For me, the only (kinda/sorta) likely thing I can come up with is a disagreement about her rights to trade, but this has to go very wrong, to lead to the USA jumping in.
So, what are some folks thoughts about this?