Here's a study pointing to family and faith as the answer.
Here's the result of Professor Jeynes' study:
One of the most notable findings that emerges from this study is that using the NELS dataset, when African American and Latino children who are religious and come from intact families are compared with white students, the achievement gap disappears.Note he says, "the achievement gap disappears." Isn't reduced. It disappears. That gets to the heart of the matter.