For weeks, months, sometimes as long as a year, they waited in the dungeons of the slave factories scattered along Africa's western coast. They had already made the long, difficult journey from Africa's interior -- but just barely. Out of the roughly 20 million who were taken from their homes and sold into slavery, half didn't complete the journey to the African coast, most of those dying along the way.
The captives were about to embark on the infamous Middle Passage, so called because it was the middle leg of a three-part voyage -- a voyage that began and ended in Europe. The first leg of the voyage carried a cargo that often included iron, cloth, brandy, firearms, and gunpowder. Upon landing on Africa's "slave coast," the cargo was exchanged for Africans. Fully loaded with its human cargo, the ship set sail for the Americas, where the slaves were exchanged for sugar, tobacco, or some other product. The final leg brought the ship back to Europe.