The Central African s.l.a.v.e trade progressed into the 19th century. Although, the Portuguese retreated into N/Central Africa when the French trade wane. Read below about the s.l.a.v.e trade in Central Africa.
Trade resources such as African natural resources drew Europeans to West Africa. As need for cheap labour to work on plantations in the Americas rose, people enslaved in West Africa became the most valuable 'resources' for European traders.
Consequently, Brazil bought more slaves than ever before from Central Africa in the first half of the century, continuing to use slaves until the 1880s. Slavery existed in Africa before Europeans arrived.
Therefore, the answer is as given above.
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