>> "Not all humans are born the same, of course, and the innate character and intelligence of some is more suited to mastery than slavery. For others, it is more suited to slavery. And others still are badly suited to either. These characteristics can be expected to group differently in human populations of different origins. Thus, Spaniards and Englishmen in the Americas in the 17th and earlier centuries, whose sense of political correctness was negligible, found that Africans tended to make good slaves and Indians did not. This broad pattern of observation is most parsimoniously explained by genetic differences."