I'm shocked that Caplan being an Africa "scholar" doesn't know that slave ownership is still very common and open in the year 2016 in many parts of the African continent today. However it's amongst the various superstitious and corrupt sects, groups, clans and cultures of Africa. Caplan instead of being so condescending against a tolerant liberal democracy like the US and its people, why don't you research and advocate for the slaves in Africa who really need your help?