Conversation so far:
What racial categories were there?
Mesoamerica, in reference to the cultural area where several complex civilizations developed before the arrival of the Spanish in the sixteenth century, and Aridoamerica (or simply "The North".
What racial influences are there?
Mesoamerica was densely populated by diverse indigenous ethnic groups which, although sharing common cultural characteristics, spoke different languages and developed unique civilizations.
Who did they gain independence from?
When Mexico gained independence in 1821, the casta system was eliminated as a legal structure.
What was the casta system?
This system gave more political and social power to Spaniards so that Indigenous people and blacks could be kept in lower positions.
anything else?
Under the Mexican government, some indigenous people had land rights under ejido and agrarian communities.
What else happened under the mexican government?
Under ejidos, indigenous communities have usufruct rights of the land.
Indigenous communities choose to do this when they do not have the legal evidence to claim the land.

Question: Anything else unique about the indigenous people?
Self-contained rewrite: Anything else unique about the indigenous people aside from having usufruct rights of the land?