You and I disagree on this topic. Intelligence is heritable. Choice is a voluntary. As for quartering blacks into economic deserts we can blame the civil rights movement. Do yourself a favor and examine some of the key socioeconomic statistics (illegitimacy, violence rates, business ownership) pre v. post civil rights movement.
When blacks, like other groups championed government intervention into their lives (desegregation, family and social welfare programs) the subsequent reverberations resulted in a net negative.
However, due to the aforementioned IQ, blacks are less equipped to navigate around those barriers to their success. As a result one beget the next beget the next until the black is once again (for a large part) on the plantation.
However...stupid is , as stupid does.