Southern slaves produced the cotton, and workers at Northern mills (who were paid not much more than slaves) turned it into clothing, bedding, and other items. This was the main reason many Northerners were against abolition: the loss of slave labor would affect not just the South's plantation society, but the North's industrial economy as well.
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The US textile industry was built around the growing of cotton. Some large cotton farms were known as plantations.
As the farmlands in the Southern States prospered by growing cotton and tobacco, plantations expanded. There was a world market for these crops and the Northern States also bought cotton for their textile mills. To continue to grow, more slave labor was required. Thus, slave traders sought new slaves from Africa to meet this demand.
Primarily, cotton and tobacco.
The economy of the southern states(not colonies) was dependent on large plantations due to the production of cotton, the souths cash crop during the 1800's.
Well...all they did was use big farms(plantations) to harvest cotton.