Cosmopolitism and Issues of Ethical Identity

[...] what about the socially constructed forms of race under which the West imposed ruthless slavery in Africa, even African elitist bourgeoisie who imposed/are imposing injustice and inhumanity on the indigenous populations using tropes of race? Just recall that, because the lighter-skinned children of black Americans often "passed" for white- adopting a social identity as a white person- there are millions of Americans whose ancestors were African slaves and who are now sure they are white.