Are all Hispanics considered under represented minorities (URMs)

There is a big difference between a match and a safety for an URM and a match and a safety for regular applicant. MIT states that they will accept every qualified Mexican, Puerto Rican, AA, and NA. They certainly don’t accept every qualified applicant. All Hispanic applicants at MIT are not created equal. What I am asking is if this is the case at all other schools, particularly Ivies. For example, at Tulane, all Hispanics are treated as URMs. My scores are well within the averages at any of the Ivies, but the averages are skewed by special admits, URMs, etc. This is why I am asking.