In my opinion, it's this:
% of children living in a one-parent household:
Asian - 13%
White - 24%
Hispanic - 36%
Black - 58%
It's no surprise Asian-Americans have the highest standard of living in the U.S.
And just think, one of BLM's cornerstones of their platform is an anti-nuclear family concept.
About one-third of U.S. children are living with an unmarried parent | Pew Research Center
Studying to succeed (as opposed to idiotic degrees that are worthless in the real world) is strong in the Asian family unit and failure is seen as an embarrassment, not just to the student, but to the family as well. In Japan for example, the suicide rate is the second highest among the industrialized countries. Because of their collective societies and pressure to succeed by their families and peers, they out-perform whites, blacks and Hispanics.
As for blacks, well, there are three basic problems:
1. Single parent households are a definite contributor. The single parent is generally trying to hold down two jobs to cover the cost of living and raising how ever many children he/she has. Thus, the single parent is rarely present to advise and assist the students in their studies. That doesn't eliminate the fact that there are just some parents that shouldn't be parents (age, negative-culture, criminality). But, that's a whole other issue.
2. Educational systems in Democrat run large metropolitan communities. Their initial response to encountering black students who had difficulty learning subjects, was to do a "knee-jerk" reaction and just "dumb-down" the material, not realizing that everybody learns in different ways and that such students don't generally have parental assistance after school. Teaching has to be done, tailor-made to how each students learn.
3. Culture. It may offend some and there are those that will even say, it's racist, but here's the fact. It's not! No matter what nation you live in (Botswana, Tunisia, Rwanda, China, Japan, Norway, Russia, et cetera), to succeed, you have to have a fluent grasp of the nation's language, more than one language preferably, put in your best effort to learn the material while in school and on a job, Don't be afraid to ask. Get some assistance where and when you can and have a bit of good luck. So, if your particular culture doesn't advocate a strong work ethic, study and personal growth, it's betraying you and ensuring you will fail, unless you just happen to have some talent that people will pay to watch.