La Raza refers to the new race formed by the admixture of Spanish and Aztec blood.
It is, however, very much part of the radical Mexican identity though — and these creeps have much more allegiance to Mexico than they ever will to the USA.
Mexicans are a racial mix of Aztec, Spanish, French, English, German, Italian and Arab. Mexico has 62 indigenous languages from various tribes. It would be like calling "American" a race. My father-in-law was Yaqui and French from Chihuahua Mexico. His daughters carry mostly French racial characteristics including green eyes.
We are all mutts.