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Which PODs would be required to get rid of slavery/slavetrade of sub-saharian african populations from the Age of Discoveries to the Victorian Era but yet making them prevalent in America during all this period and to the present day? It is estimated, for instance, that half of Brazil's modern day population descends in some degree from sub-saharian african people, not to mention a large portion of black skinned population. Needless to say how influential it was in Brazil's culture and society.
The Caribbean and USA also suffered substantial influence by this African-America people flux. So, how to bring them to America without commiting such a huge crime against humanity as slavery was?