Unionblue, I've given thought to that question several times.
The civil war, started in the infancy, of the industrial revolution. One of the things, that greatly increased, the need for more slave labor, was the invention, of the cotton gin. The cotton gin, made it easier to separate, the seeds, from a variety of cotton, that was almost impossible, to seed, by hand. Also this cotton plant would grow much easier, and in a wider variety of places. If the south had won the war, I believe the industrial revolution, would have continued, but at a slower pace. Still, as farm machinery would be invented, it would have taken the place of the plantation labor. In the long run, the cost of using machinery, would be cheaper, than the expense of keeping slaves. If slavery continued at all, it probably would have been, in the form of a housekeeper, or house labor, or a personal servant, and slavery in that form, would have probably ceased to exist after awhile.
Gunsmoke