BTW the study showing increases in income among black for different age groups over different time horizons has a serious flaw.
In the 90s and in the "00" there was a sharp increase in black college grads. So part of the increase reflected that blacks in general, and black women in particular. were achieving higher levels of college attainment.
Not an Obama benefit. Just black females being more aggressive in obtaining college education. So the younger cohorts would see income increases more rapid than older cohorts, so we aren't comparing the same population.