I am also struck by the lessons that emerge from looking at how trends in family formation have differed by class as well as by race. If we were once two countries, one black and one white, we are now increasingly becoming two countries, one advantaged and one disadvantaged.
I see here a crucial difference between the two kinds of division. You can't change your race, and you can't change the family you are from. But you can mostly determine the family that you make, the family your children will have.
Marriage is an advantage that you can choose.