Yeah, Maryland is simply ASB. That would entail ceding Washington to the Confederacy, something not even the most delusional Copperhead would ever have done. That isn't even touching the rest of that stuff. Getting past the peace treaty, their government was too dysfunctional, and their territory too lacking in resources to rise to Great Power status, and that isn't even accounting for the fact that almost half of their population would have been slaves by 1918. There's just way too much wrong with the CSA for it to have righted itself, and its ruling class wasn't interesting in trying. And even if it did, I just don't think the American South alone had the latent potential to be a Great Power.