Actually goes into great detail about which tribal leaders DID and did not involve themselves in the slave trade. I'll give you the benefit of the doubt that you are smart enough to know that there are hundreds of ethnic groups in Africa...so selling "their own people" in a literal sense was quite rare. Selling rival groups, prisoners of war, or just allowing "slave raids" did occur......the capture and selling of HUMAN BEINGS......shameful. The entry(quite large) about internal Slave trade that did and does occur in Africa is quite detailed...... These are recognized SCHOLARS involved in this book, not amateurs.They don't hide the truth or revise history. They tell the FULL story.....they'd be insulting the intelligence of the reader if they didn't.