BA, don't be an idiot. A person is a person - legally it can also be a company, but since companies are not "born" the constitution says you get citizenship if you are born in the US. It does not matter if your parents were from Africa, Guatemala or whereever. You want to change that, change the constitution, do not squeeze through the backdoor.
{ but many many Mexicans are actually natives}
This is actually true because California and some other states were part of Mexico so many Mexicans would naturally have roots in these regions.
If 90% of native Mexicans were wiped out in the first century, that would mean those roots come from immigrants. Immigrants cannot be native to a land by definition.
If by native you mean from Spain, then yes, many Mexicans are natives. But real natives in that area spoke Arawakan, Aymaran, Cariban, Chibchan, Jê, Pano-Tacanan, Quechuan, Tupian, Tucanoan and Yanomaman. (thx to AI for research)
How far back will Trump take his no citizenship birthright? His ancestors immigrated to America. :/
I am not sure where are you getting your info, but if you have visited Chichen Iza, Coba, Tulun... they are mostly all of the original Mayan and other races (as native as it gets). If you look at most Mexicans and some Spaniards, you will find that they are mostly different.
You may be confusing Latin America with North America in which effectively the natives were obliterated and the few remaning live in reserves.