Was there any substantial evidence that they had contact? Was there trade between them?
[edit] Cortes*
I'm not sure I understand your question. The Aztecs were Native Americans, specifically three groups of Nahuas: Mexica, Acolhua, and Tepanec. They had "contact" with dozens of other Native American groups throughout Mesoamerica: Otomi, Purepecha, Huaxtec, Totonac, Zapotec, Mixtec, various Maya groups, etc.
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