Mexico, which dates back to 14th century Mesoamerica. The Nahuatl word Mexico means place of the Mexica but the ethnonym Mexicatl itself is of unknown etymology. Aztec legend that their gods told them to build a city where they spot an eagle on a nopal eating a serpent, which is now Mexico CityAztec legend that their gods told them to build a city where they spot an eagle on a nopal eating a serpent, which is now Mexico City.