When you consider the entire slave states, only 10% of the people owned slaves. It was about 50% in Mississippi, 30% in Ala-Ga, etc. So slavery was only one issue. Also, records indicate only about 10% of the slave owners actually mistreated their slaves. Most slaves were better off than northern factory workers. Conditions for coal miners and factory workers in the north paid such low wages, that they really "owed their souls to the company store". In reality, 90% of the American people both north and south owned or worked their own farms. Most who fought for the south didn't own slaves, but fought for their states. Most young poor southern men after the war went west to see what they could find or do. Most plantation owners went to the share cropping system with their former slaves. If slavery was so bad, why did most stay and not go north after the war. The south was not Nazi Germany. Slaves were more valuable alive and healthy, not starved, worked to death, and murdered.
That being said. 90% of manufacturing and ship building was in the north. South didn't stand a chance relying on exported cotton to buy war materials. Today is it a whole nother situation. The south has far more industry, longer growing seasons. Combined with the plains and mountain states constitute a large enough confederacy to actually succeed if they wanted to. 22 states have or are getting petitions. Cutting out give away programs in these states would be a problem, with most peaceful takers moving to the hand out states. Others might be a problem and could actually lead to a "civil war" within the states with high minorities.
When the federal government colapses, a confederacy will have to be made by the states for mutual self defence. Illegals will be shipped out, the parasites will have to learn to make a life on their own.