Black Africans enslaved over 1 million white Europeans mostly by Barbary Pirates.
Black Africans also captured and enslaved the Africans that were shipped to the Caribbean and US. There weren't roving bands of white slavemasters killing and enslaving blacks. Africa was and is dangerous and inaccessible. Tribes enslaved other Tribes and sold them for profit or traded them for goods.
Of course none of this is taught in US schools. They just teach that terrible, mean white folks had black slaves and it's cause for all white Americans to feel really guilty. Nevermind the fact that about a third of the slaves sold in New Orleans for example were sold to black slave owners in the US. Never gonna read about that in a public school textbook, either.
I learned every fact stated above from an extremely intelligent and highly educated black man named Thomas Sowell. He has taught at Harvard and Stanford. His videos are all over youtube, and his quotes pop up in threads here pretty regularly.
Heres a short version:
Heres more in depth:
He has authored about 40 books by now IIRC regarding history, economics, etc. Amazing man. He was born poor in Gastonia, NC right outside Charlotte.