First, congratulations to your son on his acceptances.
Your ethnic background may help your son’s chances for admissions at colleges which have preferences for URMs, and at which Hispanic kids are considered URMs. This is most common at private colleges, since many public university systems are no longer allowed to do so. There are also scholarships which are aimed at kids from this or that heritage, but these are generally from outside sources.
In general, colleges themselves provide two types of support. One is financial aid which is dependent on family income, and not on racial/ethnic background, and the second is merit aid, which is dependent on academic achievements. There is also merit aid which is only available to kids from low income families.
I have not heard of any college which will provide a “free ride” to a student based solely on their ethnic or racial background alone. Again, there are private foundations which provide scholarship to students from specific ethnic, racial, religious, or geographical backgrounds, but these scholarships, especially ones that provide any substantial amount of money, are invariably also merit based.
If your kid has been accepted to a college, you should check all of their available scholarships and other types of financial aid, and see whether your kid qualified for any of the types of financial aid provided by that college. Most colleges should notify you or your son as to which scholarship/s he is eligible, and how he should apply to them (sometimes accepted students are automatically considered for scholarships, and do not have to apply on their own).
While most of the outside/private scholarships that are available are relative small (anywhere from $250 to $15,000), they can add up. So it is worthwhile for you and your son to see for which of these scholarships your son is eligible.
May I ask to which colleges he was accepted? That would help people figure out whether there are scholarships available to him. If you provide his GPA and test scores, it would help more. However, i understand if you do not wish to share this information.