According to daniel patrick moynihan, what is the root cause of african americans' economic problems?

I believe the answer is: the matrifocal family

the matrifocal family refers to a family structure when the mothers become the head of the family.

According to statistics, more than 65% of African American familes are supported by single mothers, and this would often cause a hard time for the single moms since they have to juggle between their career and taking care of their households.