Quote from Ricter:
Jim Crow ended much more recently, and though the two subsequent generations are working to catch up, so are the generations that started out ahead also working. Thus, the differential persists. It's not an excuse for bad behavior, but such differentials always and everywhere lead to trouble, but particularly if they are perceived to be unfair, i.e. illegitimate.
That's complete horse shit , in 2 generations immigrants that want to make something of themselves overcome even more obstacles (namely language and educational deficits).
Comparatively jim crow has nothing to do with it except in the minds of the excuse makers.