Slave ships were large cargo ships that had been changed so they could transport slaves.
They were key to the triangular trade. Slave ships brought newly enslaved African people to the Americas. This trip across the Atlantic Ocean was called the Middle Passage.
Between 1526 and 1867, slave ships took around 12.5 million slaves from Africa to the Americas.[1] Conditions were horrible, and around 1.8 million slaves died along the way.[1] This was the deadliest migration in human history.