Conversation so far:
What languages are/were spoken by the Indigenous people of mexico?
62 indigenous languages as "national languages" which have the same validity as Spanish in all territories where they are spoken.
What is the most popular (or a few of the most spoken) language(s) from these 62 ?
which have the same validity as Spanish in all territories where they are spoken.
Are there different culturally different people residing in different territories ?
recognition of indigenous languages and the protection of indigenous cultures is granted not only to the ethnic groups indigenous to modern-day Mexican territory.

Question: What is significant or unique about the ethnic groups and or their culture ?
Self-contained rewrite: In addition to languages, what else is significant or unique about the Indigenous peoples of Mexico's ethnic groups and or culture ?