When comparing colonial slavery to nineteenth-century slavery, what was a major difference?

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In the colonial period, the economy was more diversified and not as heavily reliant on cotton as it was in the nineteenth century, especially in the Southern United States. Cotton became the dominant cash crop in the 19th century, driven by the invention of the cotton gin in 1793, which made cotton processing more efficient. This led to an increased demand for slave labor in cotton fields.

When Comparing Colonial Slavery to Nineteenth-Century Slavery, What Was a Major