Final answer:
The cessation of the legal international slave trade fostered the growth of a vigorous internal slave trade, particularly between the Upper South and the Deep South.
Explanation:
True. The ending of the legal international slave trade led to the growth of a robust internal slave trade, particularly from the Upper South to the Deep South, where cotton production was expanding rapidly. This internal trade involved the sale of slaves within the United States, with states like Virginia supplying slaves to meet the demands of the booming cotton economy in the Deep South.
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