Final answer:
In the 19th century, the value of African slaves increased dramatically due to the peak of the slave trade in the previous century and the subsequent abolitionist movement.
Explanation:
In the 19th century, the value of African slaves increased dramatically. While the slave trade peaked in the 18th century with the expansion of American plantation production, it continued into the mid-19th century. The abolitionist movement in the late 18th century led to a gradual decline in the slave trade.
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