Looking back over 140 years and claiming economic fact is meaningless. Looking at the mindset of the men of the period, and their reasons for their rebellion, is not. There was not a single Southern leader I'm aware of who was not convinced in 1860 that their great grandchildren would be enjoying the benefits of slavery. That is why they chose to rebel to defend what they saw as threats to their institution. And which is why claims that slavery would have ended in 20 or 40 or 60 years is pure speculation without any basis in fact.
Also, there would have been no chance of the former slave being free in the United States. If the South had no more use for slave, they would have either been sent to Africa or would have been sold to slave owners in other countries.
Those FACTS were established before the war in the north. But you forget slavery did not end after the Civil War now did it? No it did not. It still existed north and south. It simply wasn't called that anymore. The only thing that actually ended slavery in the U.S. was advances in Technology!!!