They lack the physical attributes required: extreme height, strength, quickness, reflexes, explosive power, speed, and amazing hand/eye coordination.
That combination is found almost exclusively among African-Americans.
The other big demographic group to gain in the census count was non-Hispanic Asians.
Unlike Hispanics, whose growth slowed from an increase of 43.8% between 19, Asians kept close to their increase of 34.6% in the 1990s.
Welfare/Family Aid/K-12 Education then is basically a matter of taking money from middle class White families, that have only one or two kids at the most, and do not rely on welfare, to fund the welfare-dependent Mexican families that start with (often single mothers) at age 15-16 or so, or at best at age 18-19. The charts and data show conclusively why California is falling apart. The standard cry by educators and liberals is “educate them.” Well, education has proven ineffective.