Henri Christophe
L'empereur
Thats where we get into the issue that civilization is not the same as a nation. The name of the game is civilization, I would argue that to not complicate things post colonial nations should not be part of it, but with the inclusion of America, Canada, Australia and Brazil in the same game as say Egypt and Sumeria, it really makes it messy.
Canada is also a word of native origin, should it be a native civ? heck America is a word derived from an Italian sailor...and yes Mexico is derived from Nahuatl, ethymology really isn't a consideration to weather it makes it in game. the devs have made it clear, they don't care if it's a modern "civ" as long as it fills the map, It's fun to play and, lets get real, if it sells.
I think the one obstacle you could argue Mexico has against It's inclusion in game is the map, as it overlaps a lot of civs, but mesoamerica, like say the middle east, and europe is crammed with interesting cultures that very often overlap geographicaly. If all the post colonials have made it in, Mexico could as well.
The Canadians just take an ameridian word who was never used before with the same meaning, as far I know Canada means village. Also Haiti, Cuba, Uruguay, Paraguay, Chile, Texas, Wyoming, Ohio and many others places in America have an ameridian name, but I don't think is the same.
I guess you are Mexican, because I already saw you in this forum before.
The Mexican have much more from the Mexica heritage than just your name and seal on the flag. First of all, most of mexican have indian heritage, I was working in Mexico recently and was astonished, even the white people has slanted eyes. The Catholic faith in Mexico has many Mexica influency as the "El Día de Los Muertos" y "la virgen de Guadalupe" who is just the countinuos of the Coatlicue, the Aztec god who was praised at the same mountain where is today's Basilica de Guadalupe.
Even if Mexico was united under the New Spain, the capital was the Mexico City who spread the Mexicanish to areas as Yucatán or Oaxaca, making now everyone feel as they are all mexican. And in the Independence moment they need to wirte down their history, Mexico just copy the model made by USA and start to think about they self as a nation just after the independence. But despite the official history of Mexico says it's just ~200 years old, I still thinking you have so many Mexica influency and would re-think about your own history as ~700 years old.
I made a OFF topic somewhere else to discuss when born the nations, a french guy answer me about the kingship of Clóvis I, who was a germanic king.The Frankish Empire is viewed by almost all historians as a separate nation from France, especially as Germany, the Low Countries, Austria, the Czech Republic, Slovenia, Monaco, Switzerland, Lichtenstein, San Marino, Vatican City, and Italy, as well as partially Poland and Hungary, and, indirectly, England, can also trace the roots of their post-Fall of Rome nationhoods to the Frankish Empire.
See it here: https://forums.civfanatics.com/threads/off-how-old-is-your-country.651080/