All of this seems to suggest that there is something about the American education system - and perhaps our overal culture - that is failing our children, and our black children in particular.
This also makes me wonder if there's data about the mobility of native vs immigrant blacks. If it's similar, it would align with other data that show that degree attainment only serves to partially overcome the barriers to upward mobility placed in the way of black workers.
I'm of the opinion that many of the impediments that punish or withhold assistance from minorities often bleed over into mainstream American life. The specific drum I'll keep beating is that if, perhaps, the infrastructure to battle the crack/cocaine epidemic as a public health issue had been allowed to be built to a robust state, the opioid epidemic would not have become so dire. The apathy towards these issues, even as they encroach upon "mainstream" middle class life, must be part of the mechanics of the calcification of class in America.