Black Africans were slaves in their own country. The White Europeans didn't raid and pillage parts of Africa to put black men/women into slavery. They were invited by the black slave owners who willingly sold their own people for profit!
In addition, black tribal leaders sent their delegates to America to try and persuade Lincoln to allow the slave trade to continue! The black slave owners wanted to continue to keep their own people in slavery because they made big profits from it.
Black's are just as much complicit in the Trans Atlantic Slave Trade as anyone else! You'll just never hear that from ignorant American blacks or white liberals.