There are quite a few threads about the South doing differently in the Civil War, and whilst reading about Russian-American relations during that period, I found something interesting. The Russians had an extremely positive relationship with the North. The Baltic and Pacific fleets of Russia were actually moved to America's West and East coast. As well as this, both Britain and France favored the Confederacy to varying degrees.
So if at any point one of these powers were to join (and presumably bring the others into a conflict), who would win? Would the NGC join? What would the consequences to America be?