A main cause of the trade was the colonies that European colonies were starting to develop. Also some African societies had long had,their own slaves and cooperated with the Europeans to sell other Africans into slavery.
Answer:
D. The Mississippians built huge mounds for religious purposes.
This is the only thing that's differnt from the Ancestral Pabloans.
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B; the tradition of only serving two terms
B the civil rights movement of the 1959s and ‘60s
The answer is D, the 9th amendment.
Brainliest please <3