Let’s face it, most “Mexican Food” isn’t Mexican. Let’s take a look at the common taco.
If it has a corn flour tortilla, it’s okay. But a wheat flour one isn’t as wheat was only introduced to the New World with the arrival of the Spanish.
Lettuce? Another European addition.
Tomatoes? They came from Peru after the Spanish showed up.
Beef or Chicken? Sorry. Another European deal. Fish is okay as that was a major Mexican protein source.
Chilis in the sauce are okay as all chilis originated in Mexico.
Chili con carne? Oops. Beef.
And how many platters come with rice? That came from India by way of the Philippines.
I could go on and on but will direct you to this Pocket article @ The Myth of Authenticity Is Killing Tex-Mex - Eater - Pocket