If you have an interest in race, read some of the books by Thomas Sowell, an economist who happens to be Black, Conservative & very intelligent. The books are a good read. He talks of Dunbar HS, Washington, DC prior to the welfare mentality & how a 1st class institution was driven into mediocrity by the system.
I for one believe there to be no race based lack of mental capacity. I see to many intelligent individuals of all races. Though I do believe initiative to better oneself may be because of ingrained perceptions.