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Study your history. The cotton gin did more to prolong slavery than any other piece of machinery. It made cotton growing far more profitable by making it easier to clean the harvested boll. That’s where the slaves were needed - in growing and not cleaning.
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I merely meant w/ the industrial revolution, slavery was to be short lived.
By any commonly accepted definition of the period, the Industrial Revolution began around 1760 and ended between 20 and 40 years before the outbreak of the Southern rebellion. Slavery was still alive and well.
If your position is that mechanization would have shortly replaced slavery I'll point out that the first practical mechanical cotton harvester was not marketed until the 1930's and the pesticides that did away with the weevils and such didn't come out until the 1950's. So slavery under your scenario had a ways to go.