Conversation so far:
What languages are/were spoken by the Indigenous people of mexico?
The Law of Linguistic Rights of the Indigenous Languages recognizes 62 indigenous languages.
What are the most popular (or a few of the most spoken) language(s) from the 62 indigenous Mexican languages?
The only single indigenous language spoken by more than a million people in Mexico is the Nahuatl language.
Are there culturally different people residing in different territories in Mexico?
In 2015, 25,694,928 people in Mexico self-identify as being indigenous of many different ethnic groups.

Question: What is significant or unique about the ethnic groups and or their culture?
Self-contained rewrite: What is significant or unique about the ethnic groups and or their culture in Mexico?