it is too much work on a parent.
Sadly, children with parents who do not have the ability or desire to help their children, end up with children who do not achieve.
Government cannot replace a parent. Government has tried with disastrous results, but that still remains true.
By the way, this also applies to any other race of people. It's not just Black people.
Parents who suck at parenting produce kids who suck.
It sure as hell helps when there are two parents. Two sucky parents usually can pull things together and make one good parent, which is usually enough.