because unlike the North the south didn't have the right economic system for it to have factories. The South was not industrialized like the North was, therefor it had slaves. also it had large plantations of cotton and other plants, that farmers couldn't harvest alone so they used slaves.
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south
The upper South did not have to rely as heavily on slave labor because their farms were smaller. The lower South had huge cotton plantations.
The south used slave labor because the land was nice and lush. which means in needs croped and harvested extra help was needed.
The economy of the South was dependent upon slave labor.
The North believed in a free labor system and the South believed in a slave labor system.