Answer:
The trans-Atlantic slave trade was the largest movement of people in history. Between 10 and 15 million Africans were forcibly transported across the Atlantic between 1500 and 1900. But this figure grossly understates the actual number of Africans enslaved, killed, or displaced as a result of the slave trade. At least 2 million Africans--10 to 15 percent--died during the infamous "Middle Passage" across the Atlantic. Another 15 to 30 percent died during the march to or confinement along the coast. Altogether, for every 100 slaves who reached the New World, another 40 had died in Africa or during the Middle Passage.
The Atlantic slave trade, however, was not the only slave trade within Africa. Nearly as many Africans were exported across the Sahara Desert, the Red Sea and the Indian Ocean from 650 a.d. to 1900 as were shipped across the Atlantic. Islamic traders probably exported 10 million slaves into north Africa, Arabia, Yemen, Iraq, Iran, and India. In addition, it now seems clear that during the era of the Atlantic slave trade, many and perhaps most of the enslaved were kept in Africa.
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