Before the sixteenth century, slavery was not regarded by anyone (outside or inside Africa) as a particularly African institution. The association between Africa and slavery emerged in the fifteenth century. It was then that ship design made it possible for sailors from the Mediterranean to make long journeys down the coast of Africa and ultimately across the Atlantic to the Americas.
The sheer number of slaves taken was unprecedented. The large scale of trading destabilised the social and economic order. By the end of the 18th century one historian estimates 70,000 people a year were captured and taken against their will to the Americas. What is now Angola was reduced in parts to a wasteland. In total, at least 12 million Africans were forcibly removed from the continent.