Eh, I mean if you look white people are going to act like you're white.  If you had to check a box somewhere, you could check Hispanic.  We don't have too many Argentines.  It used to be mostly Mexicans that came here, but lately (last 20 years probably) it's Guatemalans, Salvadorans, and Colombians.  And of course Puerto Ricans have a very easy time coming to the US