Slavery in Africa continued in its traditional forms, including incorporation of slaves into households and the export of slaves to the Mediterranean and the Indian Ocean regions. The growth of the plantation economy increased the demand for slaves in the Americas, leading to significant demographic, social, and cultural changes.
The explosive growth of the Atlantic slave trade was due mainly to the rise of plantation agriculture in the Americas. Plantation agriculture began with sugar production in Portuguese Brazil & later expanded into Spanish, British, French, & Dutch colonies in the Caribbean. Plantation agriculture developed further as Europeans introduced new crops like cotton & tobacco into the American plantation systems.
The Spain's Rigid Social Structure in the 'New World'