Tribes are governmental and political entities, not racial groups. This is a principle embedded in U.S. law from the very beginning and explicitly recognized by the Supreme Court in Morton v. Mancari in 1977.

Is tribe and ethnicity the same?

Ethnic group is a set of social group having a common national or cultural tradition. Tribe is a social division consisting of families or communities linked by blood ties with a common culture and dialect, having a recognized leader.

What is my race if I am Mexican?

Hispanic or Latino: A person of Cuban, Mexican, Puerto Rican, South or Central American, or other Spanish culture or origin, regardless of race.