The use of enslaved African people for labour was not new. The Spanish and Portuguese had been using enslaved African people since the 16th century.
However, the Atlantic slave trade of the 18th century was a new kind of slavery and on a scale much greater than ever before.
It was the British who played a major part in this trade. The West Indian plantation owners increasingly turned to enslaved African people for labour.
These seven factors led to the development of the slave trade: