During the nineteenth century, in which region of the United States did the plantation system play a key role in the economy and way of life?

The South

Explanation:

The Southern region of the United States was the region that primary relied on salve labor via the plantation system to support the economy. Many different cash crops (tobacco, cotton, sugar) were sown and tended to by enslaved black people, and then sold to other regions of the US for money; this fueled the Southern economy (and most of the US economy in general) for around two centuries.

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the correct answer is :

{b.}   ( american workers lose job opportunities )

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