Here is a link to a video someone posted a couple of months ago which presents a more complete history of African slavery, highlighting the 1,400 years the Arab/ Muslim world was involved, and also the roles of Elite Africans who captured their fellow blacks and sold them to the Arab slavers. Worth the time for anyone interested in the subject.
http://www.clarionproject.org/videos/forgotten-slaves-1400-years-muslim-enslavement/
Well you don’t trash GM for selling cars!