Exactly... People don't understand that 'real' slavery are expensive, tedious, unpractical on long run. Instead if you use machines and ENSLAVE poor people to work for misery salary, you will earn more shekels... Without any troubles with dealing with 'slaves'. Historically slavery on south come to his natural end. Industrializations was inevitable, it was only matter of time when slavery will be abandoned on south. Civil war only speed this process... in worst possible way. But this is another story.