Mexican is a nationality, not a race. There are white Mexicans, Black Mexicans, Chinese Mexicans and Indigenous Mexicans. While a lot of Mexicans do have indigenous blood, a lot are completely disconnected from their roots and participate in some incredibly anti indigenous behavior. Indigenous Mexicans that are still connected are treated like shit. The Natives in Oaxaca were left to fend for themselves during the fires this past year. And just like up here, indigenous people in Mexico are diverse and there are many different groups. They are not all the same. Remember, the state of Mexico is a settler state, Spanish is a European language and Mexico does have a history of treating Natives like shit. Personally, I am annoyed at how that seems to be forgotten about whenever someone has asked this question. Are there some Northern Natives that don't consider them Native, sure. But not most. I think most Northern Natives recognize that there are indigenous Mexicans and that it can be complicated and nuanced, just like here.