Someone should do an empirical study of the transitions from the OP to the conclusion of a thread in any given PCF topic and what it reveals about the underlying assumptions of a given way of viewing the world. Because on the face of it, the connections appear to have no logic. Case in point: we've jumped from Affirmative Action to African literacy rates before European colonialism.
In my opinion, this dead on reveals the persistent assumption that Africans and their New World descendants are "backwards." Seriously, why are we talking about Africa's precolonial past from the perspective of contemporary US race relations? There's no logical explanation, it has everything to do with the dominant discourse and the continuing attempts to in various ways justify the positioning of blacks at the bottom of the racial hierarchy. As someone else put it, this is why we need Affirmative Action.
I'm waiting for someone to start quoting the bell curve.