<p>NHRP uses 1/4 as their benchmark. Mexico and Spain both count by their definition, which makes you 1/2 Hispanic.
<a href=“For Students: National Recognition Programs - BigFuture”>College Board - SAT, AP, College Search and Admission Tools;
<p>This article is 3 years old, but quite good:
<a href=“Multiracial Students Face Quandary on College Application - The New York Times”>Multiracial Students Face Quandary on College Application - The New York Times;