I am doing some research on this matter in Orange County, California and it is not totally correct to say that this was a rigidly enforced policy, at least in the this area. While many Hispanic students were forced to attend segregate schools in Orange County, and I have talked with one who was, there were others who were integrated with white school children. It is difficult to get a grasp of the factors involved but it may have included the color of the children's skin and their ability to speak English.
That isn’t wholely true, about all Hispanics attending segregated schools.
I attended shools all over southern Cal during the ‘50s. None were segregated, not even the ones in Orange County. In fact, many Hispanic children attended Parochial schools, like me, and received fine educations.