ONLY the 5-6 % of slave-OWNERS (about the same percent of northerners owned slaves as did southerners) cared enough about slavery to fight a skirmish over it, much less a war. over 90% of southern soldiers/sailors/marines had GROSS ASSETS in 1860 of 25.oo USD or less. they owned no slaves & couldn't have afforded a slave IF they had wanted to buy one.
furthermore, the common soldier of the CSA was "no friend" of the "planter aristocracy" (had the south won, the planters might well have been NEXT on the list of dixie's enemies!)and would NOT have "lifted a finger" to protect some rich aristocrat's "right to trade in human misery". they certainly would not have volunteered to bleed/die for that "right".
the VAST majority of the southern population simply wanted FREEDOM from a government that they believed was acting AGAINST their interests . it was really NO more complicated than that. (fyi, my family were poor farmers. the "Big House" was a distant socially/financially/educationally from our family 160-acre farm as the MOON!)
free dixie,sw