Had the South won militarily, or been allowed to secede, it was possible the non-Southern states would have gone their own way, for instance, the Old Northwest (Ohio, Indiana, and Illinois), still mainly agricultural, had longer established trade ties with New Orleans than with the Northeastern ports. To compete with the Southern ports, downstate New York (including New York City) and New Jersey, where Union support was lukewarm during the war, might have set up as a free state to avoid Federal tariffs. The manufacturing-based New England states might have gone their own way, maybe even joining the Dominion of Canada. No doubt the Mormon enclave in Utah would have declared independence, as well as California and its neighbors. Britain might have reasserted its claim to Washington and Oregon from its military forces based in British Columbia.
The dissolution of the United States into multiple entities in competition with each other would have brought British and French, and later German, intervention into the Americas, as the Monroe Doctrine would have become moot.
The end result however, is that Lincoln's actions led to the liberation of blacks, and Churchill's actions led to the end of genocide against Jews.
Slavery was enshrined as an untouchable principle in the Confederate Constitution. No idiot neo-Confederate can change those facts.
Give me a break. The Confederate Army(P.A.C.S) of 1864 could have conquered all of Europe in 1864 if you gave them a sealift over there. THe Union could have done the same, only more quickly. The Europeans were in awe of Gen Lee and the ANV.