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So i've been toying around with my own idea for a southern victory series. If I have anytime on my hands to do the research I might flesh it out in greater detail but until then i'll give some of my detailed thoughts.
The civil war lasts longer then in TL-191, the POD is Gettysburg where a confederate victory at the round tops sets the Union Army in full retreat. The CSA captures Philadelphia a few days later followed by Baltimore and ends up occupying most of Maryland while threatening to attack Washington DC.
Since Lincoln has already signed the emancipation proclamation making the war about slavery England refuses to grand the confederacy diplomatic recognition but France and Spain do leading to a long-term alliance. In a peace treaty the confederates get Maryland and Kentucky and the US capital is moved to Philadelphia. Over the rest of the nineteenth century the Confederates build up a colonial empire in the carribean and Mexico. At the same time the United States begins moving leftward and elects several socialist presidents. While the confederates enter into an alliance with France, Spain and Russia the US remains neutral. The United Kingdom does as well. On one hand they want to maintain good relations with the United States and not openly support the CSA but at the same time they want to maintain the cotton trade that the Confederacy provides.