Perhaps we need a version of the Nuremburg Laws here, to establish who is and who is not a member of the “right” groups. [/s]
The term "latino" is strange. It is derived from Latin, which in turn is derived from the region of Italy, Lazio (Latium in Latin) that surrounds Rome. Yet nowadays in the official vocabulary of the US government, it means someone who somehow is tied to the Iberian peninsula. One might have guessed that attention would have been restricted to Hispanics because the US has a lot of immigrants from Mexico who have Spanish surnames. But no. For some reason, the definition has been expanded to include Portugual and by extension Brazil. Romanians and French are not included, even they also speak a language derived from Latin. More strangely, Italians are not included, not even those from Lazio, who are the only true Latini. In the US, you don't even need a genetic "Latin" ancestry. The surname is enough. So a full-blooded Native American from Mexico with the surname of, say, Martinez, qualifies as a Latino, but someone from Rome does not, even if his surname is Marra (an old Laziale name).