:-) You can’t tell by faces.
It’s true there’s a large Mexican population in that district. So, it’s possible you’re correct. But, those boys could have any ancestry. I would expect that, if all of those surnames were Mexican, they all would’ve said so. Instead, only one boy is said in the report to have a Mexican parent. It’s possible the others are either “Hispanic” of a different origin... or they’re not. Neither of us can really know unless they tell us.
Not that it matters. It’s just an interesting side note that they’re wearing the U.S. flag with pride and not backing down from the other students.
Occasionally you will run into a Spanish name that's literally a sentence.
The odds of any of these kids having a non-Hispanic name are, I would imagine given that area, ZILCH!