On 24 August 1821, representatives of the Aztec Republic signed the the
Treaty of Córdoba which converted the "Aztec Empire" into the "Mexican Empire".
The nation of Mexico is formed, not from hostilities with "a great enemy from the sea" but from out of it's own people from a "lost world".
THE END.
NOTE: In the real world, signs of the Aztec's survive to this day all across Mexico. Many people still speak the Aztec language (Nahuatl) in villages around Mexico City. Also, of note, words from the Nahuatl language are present in everyday American life..."Coyote", "Chile", "Mesquite", "Peyote", "Tomato", "Chipotle", "Guacamole", "Tequila", "Chocolate" are not Spanish words or North American Native words, but Aztec words.
To this day, there are places that are named after what the Aztec called them. Guatemala, Yucatan, Tlaxcala, Tabasco, and last but not least, "Mexico" were Nahuatl/Aztec words and names.
Thanks for reading!