Will, would you be interested in knowing more about a slave trade that has lasted (and might still be going on) four times as long as the Atlantic slave trade and with possibly THIRTY TIMES the death toll? Seems to me you might be interested in that.

Read John Azumah Adembillah's book, The Legacy of Arab Islam in Africa. That will tell you much about the trans-Sahara slave trade. Google and read what you can about the Zanj uprisings in the Tigris-Euphrates delta region, too. That should be a decent beginning.