Slavery exists in various forms, ranging from wage slavery to chattel slavery. Chattel slavery is the lowest level, where humans are treated as property. Christopher Columbus encountered this type of slavery when he discovered the new world for Europeans.
The Atlantic Slave Trade mixes centuries of human bondage with violence, economics, commerce, geo-political competition, liberty, morality, injustice, revolution, tragedy and bloody reckonings. That sounds like a lot, yet this show merely scratches the surface of this enormous subject.