Unfortunately being an ATC as a minority is tough. No idea on any kind of %, but many hispanics (insert other background here) may not be US Citizens. Non US Citizens cannot be Air Traffic Controllers.
My dream after using ATCSim2, controlling on VATSIM and other networks was precisely to be an air traffic controller. But unfortunately, Im not a US Citizen, or at least not yet, and hence I wouldnt be hired. I beleive you can attend the different college/universities and take the courses, you just wont be hired.
Had to settle with Business/Marketing and Control aircraft online