AP® European History · Unit 1 · Topic 1.9
The Atlantic Slave Trade
The Atlantic slave trade forcibly shipped over 12 million Africans to the Americas, driven above all by sugar plantations whose brutal, year-round labor demands outstripped every other source of workers.
Sugar is punishing to grow. Cane has to be cut and processed into juice within hours or it rots, which means a plantation needs huge gangs of workers during harvest and a year-round labor force to keep fields and mills running. European colonizers in Brazil and the Caribbean tried enslaving Native peoples and using indentured European servants first, but disease, resistance, and limited supply left them short. West Africa, with established slave markets that European traders could buy into, became the source planters turned to, and the trade grew exactly as fast as sugar acreage did.
The trade moved in a triangle. Ships left European ports like Liverpool and Lisbon loaded with manufactured goods, cloth, and guns, traded them on the West African coast for captives, then crossed the Atlantic on the Middle Passage carrying enslaved people to the Americas. From the Americas, ships returned to Europe loaded with sugar, tobacco, and later cotton. Each leg paid for the next. Numbers climbed with the plantation system itself: a few hundred thousand crossed in the 1500s, over a million in the 1600s, and more than six million in the 1700s, the century of peak sugar expansion.
Inside West Africa, rising European demand reshaped politics. Kingdoms like Dahomey and Asante built armies and waged wars specifically to capture prisoners they could sell to European traders on the coast, growing wealthy and powerful from the trade. Communities without that military strength became targets of raiding, pulled into cycles of war and instability. This topic sits between the Columbian Exchange's movement of crops and the colonial economies that silver and sugar built, since enslaved labor is what made those plantation economies run.
Key terms
- Middle Passage
- The brutal Atlantic crossing on which enslaved Africans were transported to the Americas, marked by overcrowding and high death rates.
- Triangular trade
- The three-legged Atlantic trade loop linking European goods, African captives, and American plantation crops.
- Indentured servitude
- A labor system where workers were bound to a master for a fixed term, used before and alongside enslaved African labor.
- Dahomey
- A West African kingdom that built military power partly by capturing and selling prisoners to European slave traders.
Watch it explained
- How it worksShow me the triangular trade as a loop with what actually rode on each of its three legs.
- Worked exampleTrace the number of enslaved people carried across the Atlantic century by century from 1500.
- How it worksHow did a sugar plantation's appetite for labor set the arrival rate of slave ships?
- Going furtherWhat changed inside West African kingdoms as European demand for captives climbed?
Check yourself
End of topic.