Prior to the ACW most of the south (Louisiana being a bit of an exception due to "libre gens du couleur" who were established when Louisiana was acquired and continued on) was moving towards forced expulsion of free blacks, and had also tightened up on not allowing blacks to be literate. In an independent CSA this is likely to continue down this path. Illiterate and marginally numerate workers are of only so much use in manufacturing, and as factory work becomes more complex or you are producing more complex goods. Sure in sweeping up, moving stuff around the factory but for the illiterate you can't read specs, you can't do the math a machinist needs to do etc, etc. While poor quality cheap goods do move, you can't export anything other than low value added goods if the quality isn't there. While the average Joe might tolerate crappy appliances etc, the elites are going to want quality goods, which in this scenario are going to be imported which does not help the CSA balance of payments. One reason Nazi slave labor worked as well as it did, and they did have quality issues with slave produced products, was because if they caught you sabotaging the goods or even not following quality procedures, you were dead - often after a period of time wishing you were already dead. Slaves were expendable, and if they were Jews or other Untermenschen expenditure was the long term goal. Leopold's Congo worked much the same way. In the CSA slaves were a major expense, and represented a lot of the capital value of the CSA. An adult male slave would sell for ~$2,000 in 1860, approximately $61,500 in 2019 dollars. A skilled slave, like a blacksmith, would go for much more. This is not "throw away" money.