I'll take the bait but africans had been enslaving each other for centuries, even millennia before the portuguese and dutch showed up to initiate the slave trade
and even then, it was african slave drivers running the slavery gig. they would trap their neighbors and sell them off to the white man (and before the white man, to other african tribes). it's not like some safari-geared white guy was running into the jungle with a machete and a net trying to catch people with an abnormal amount of melanin