Slavery as practiced in the old South and in 16th Century Europe was introduced by muslims. Had there been no Islam then it is doubtful that slavery would have ever arisen in Europe and America.
Mohammed & Charlemagne Revisited: The Epilogue by Emmet Scott
http://www.newenglishreview.org/Emmet_Scott/Mohammed_%26_Charlemagne_Revisited%3A_The_Epilogue/
Great article. It draws heavily on material cited in John J. O’Neill’s eye-opening book “Holy Warriors.” I highly recommend it.