The oldest recipes are made of dried or scrap beef, suet, and chilis simmered in water or stock, with salt, cumin, paprika, and masa harina, hominy flour, or tortilla pieces for thickening.

Tomatoes, tomatillos, nopales, onions, garlic, beans, are all post 1900 embellishments.

...new laws were most numerous when the commonwealth was most corrupt. ~ Publius Cornelius Tacitus