This week rich nations slapped down a push for their multinationals to rightfully pay tax. The reason is in plain sight, and goes back centuries.
It was the largest long-distance coerced movement of people in history. But how did it begin, and what led to its end?
13 facts about slavery in Africa—for one European slaves were cheaper but Africans sold their own more readily
Affecting millions, it was a trade that offered a deep lesson of the horrors of forced labor of the 20th century.