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Answer:The upshot: As cotton became the backbone of the Southern economy, slavery drove impressive profits. The benefits of cotton produced by enslaved workers extended to industries beyond the South. In the North and Great Britain, cotton mills hummed, while the financial and shipping industries also saw gains.
Slavery was so profitable, it sprouted more millionaires per capita in the Mississippi River valley than anywhere in the nation. With cash crops of tobacco, cotton and sugar cane, America's southern states became the economic engine of the burgeoning nation