I wonder do they know what kind of brutal culture the Aztecs were with its mass ritual human sacrifices.
What the Mexicans never admit is that the Hernando Cortez did not simply sail over from Cuba to Mexico in 1519 with six hundred and seventeen men and conquer the entire Aztec Empire with such a small force. Cortez had a lot of help from the local non-Aztec tribes who were sick and tired of singing the song "I Lost My Heart in Mexico City".
Here is how one Chicano web page (Lies and Truths About Chicano History) deals with that issue:
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Lie: The Aztecs were bloodthirsty because they practiced human sacrifice.
Truth: Europeans practiced human sacrifice, too: they burned their "witches" alive at the stake for all to watch! The Celts of Europe burned people alive in a constructed wicker chamber in the shape of a man. The Scythians would cut off their enemies heads, and the Romans would make people butcher each other for public entertainment. The Aztecs fought war differently, as it had been done for centuries in Anahuac ("Mesoamerica"). War was a sacred duel. They did not kill just for the sake of killing like "civilized" Europeans did. The Aztecs subdued an opponent, and then that opponent was considered "dead". He knew the rules, too. he was then scheduled on the calendar for a date to be sacrificed, as a messenger to God. In this way, his life and death now signified something greater. Life and death were one and the same in Anahuac thought. There was no greater thing than to sacrifice your life for your people's honor.
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That's pretty funny but it's very true. Chicanos don't know the history of either country --not that of Mexico which they proclaim to love so much and certainly not that of the US which they don't love. The Spaniards were the saviors of Mexico, there's no way we'd be putting up with Mexicans at all today if they were still into human sacrifice.