Thank you Zoogster.
At least you're honest.
Actualy I think racism in America is quite silly as it is identified through color which is a very small part of the gene pool, and represents only a very small portion of human genetics, in fact arguably one of the least significant parts.
You realize that 'Mexicans' are 'the Indians' of Mexico, right?
The strain of cracker Castilian blood that conquered and ruled has little presence in the general population.
Actualy that is quite incorrect as most of the population is technical "mestizo" which is a mix of native, african, and hispanic genes primarily. However the self identification of "mestizo" is greatly descreasing as the term is becoming a slang term used by others to mean natives that "forget thier true heritage". When in fact it means mixed, which is what most of the population of Mexico is.
It is all the rage, and stylish to self identify with a native culture, especialy since due to many of the atrocities commited over the generations the actual heritage dating back prior to early Spanish conquest is difficult if not impossible to ascertain. The skin color and some features of the conquering ethnicity combined with portions of native and african blood is very similar in appearance and nobody will tell someone thier claimed self identity or that of thier parents or gandparents was incorrect. So people can create thier percieved heritage based on what is the most desirable option in the region of origin. Since the United States has a tradition of highlighting and creating a sense of entitlement to minorities due to prior abuses, it is in style to imagine one's self as a Native that would have been better off if only... and any current situations which are disliked are a result of interferance and wrongs commited against them.
When in fact the culture and lifestyle of an Aztec was quite brutal. A system which revolved around religious extremism, mythology, and human sacrifice, slavery, and astrological study. With many unique achievements, but far from better than even the worst case scenarios of modern American life.
However identification with natives over other aspects of cultural history is more politicly motivated than geneticly accurate. However those traveling to America are in fact largely a higher percentage of native than the general population of Mexico because they tend to be the poorest within Mexico and therefore have the greatest incentive to travel elsewhere. While much of the successful middle class and elite in Mexico have a predominantly Spanish heritage.
As for Aztlan etc, the Aztec and Myan empires were located very far south of the current border, with the northernmost point being not far from Mexico City, which also was the Aztec capital, and extending through central America.
However since most 'natives' within the Americas came across the land bridge connecting Alaska and Siberia, technicaly all south of modern US borders would have passed through the US in the journey south at some point in history. However many seperate groups crossed at various points within a many thousand year period, so are not all direct descendants of eachother, and some quite distinct.
The current border region is a very hostile climate, and without modern irrigation would have been far from ideal habitat, so most traveling through it from north to south would have avoided settling in the desert region altogether. However there is notible exceptions, and carved rock structures to prove it. Yet most of the region was claimed by New Spain, and previously by Spain, as all of the New World was granted to Spain or Portugal by the Pope in the Papal Bull Inter caetera.
So even though Spain did not settle, guard, patrol, or otherwise use much of it's claimed territory, and outside of a few missionaries hardly had explored or traveled through its claimed areas, it felt entitled to them. Much of Spain's interest in the New World was exploitation of material, primarily mineral wealth, (as well as spreading Catholicism) so the more area ownership was claimed the more all inclusive the mineral rights to the Spanish crown. New Spain would include much of the same borders which Aztlan supporters refer to as previously belonging to them.
However Aztlan supporters are taking a very politicly motivated snapshot of a short portion of history for a modern political objective.