Slavery took place in Africa for more than five centuries, African were traded within the continent and exported to the rest of the world to perform labour of different forms to nations including Spain, Britain, Dutch Empire, France and Portugal amongst others.
The transatlantic slave trading were patterns which were established in the mid-17th century this saw trading ships set sail from Europe with a cargo of manufactured goods to the west coast of Africa. There, these goods would be traded, over weeks and months, captured people were provided by African traders. European traders found it easier to do business with African intermediaries who raided settlements far away from the African coast and brought those young and healthy enough to the coast to be sold into slavery.
Slavery had different elements to it with the most notable being labour and economics. African were traded to perform labour and the traders would rip the rewards of such labour. Thousand were forcefully captured, sold and shipped across the world. Their business was dealing in humans and this became economics. After centuries this created the notion that the African were and still are inferior. By the 19th century, there was a movement for the abolition of slavery, although opposed by many of these nations which dealt in slaves, it gained momentum when the masters saw no economic potential in continuing with it. There was resistance form the enslaved African which led to abolition. Majority of these nations had declared the end of slavery and moved to a new form of slavery.