Kevin and Megh
Africa suffered huge loses because of slavery
Over 16 million people were captured and used as slaves.
This brought down the population of west Africa drastically.
However, the new food products from the Americas raised the population by a little bit.
Also, there was a preference of males as slaves. 2/3 of all slaves deported were males. Therefore, in countries such as Angola, where raiding happened most, women made 2/3 of the population. And therefore, the women had to do many of the jobs men would have to do.
Many states started raiding its neighbors just for firearms. In exchange for firearms, they gave the Europeans slaves that they captured. Therefore, states such as Dahomey got more and more firearms and therefore could raid more people.