[FirstFlaBn]

Never mentioned, but greater resistance to malaria is what made using enslaved Africans in America economically feasible. They lacked scientific knowledge, but the word spread anecdotally that blacks could work in malarial lowlands without getting sick.

This fact, not some moral superiority, explains why slavery didn’t grow in cooler dryer areas.

[editor-surveyor]

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Islam is what made enslaved Africans in America available and affordable.
.

[miniTAX]

“This fact, not some moral superiority, explains why slavery didn’t grow in cooler dryer areas.”

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Black slaves exist everywhere where there are Muslims, especially in Arab countries, even now (in Sudan, Mauritania and post-Khadafi Lybia), in can’-t-be-drier areas.
So no.