@McStinkus: You are correct, as far as close genetic structure. However, no matter how much we fight it, culture makes us who we are, in the end, as far as generalizations go. And due to that, outskirting Aztec(or was it Mayans?) groups would sometimes send troops out to collect, as far as what is known as the Mexican-American border today, only to war with the Natives of the North American soil. Though I'm sure they never sent many, as they would be spread out too thin, the time they got out that far to Northern American lands. Obviously, North American Natives knew their own lands better.
And you are also correct in the fact that most Mexicans LIKE to believe we are Spanish, when most probably aren't. I looked up my Mother's surname's brief origin, and found they are mixed from English descent(Euro), and my Father's surname links me to Italy(my dad's father, my abuelo, has blue eyes and is light skinned), but both were born in Mexico. Yet we were raised in a Mexican house, with Mexican values. So again, Culture rules us, not our genetic make up.
Also, as fate would put it, my father's dad, and my mothers dad both played in the same band; My mother's dad was the trumpet player, and my dad's father was the banjo-ist(is that even a word?). Apparently, the banjo player gets all the girls, as my grandpa was the womanizer in his hay day. They played in several places around the northern part of Mexico. A couple of years later, my father met my mother, and history was made. So who knows, maybe I might be destined for music, as a guitar player or something.
Mexican death metalz, here I come! 
