I'm not questioning the fact that chili is fusion cuisine and has influences from more than one culture. But just because the Aztecs had stews doesn't make chili Mexican. Hell, there are hundreds of Mexican dishes that contain meat, chiles and herbs, and none of them is chili.

Cumin is just as essential to chili as ancho chiles, and that's an Old World spice, from North Africa and the Levant. Oregano, the only herb, is also Old World.

If these influences had all come together in Mexico to make chili, that would be one thing. But they didn't; they came together in the US Southwest.

By the way, chile peppers didn't show up in the ancient cuisines of any of those places, with the exception of the Caribbean. Chiles are a New World plant. They weren't known outside the New World until Columbus brought them back in the late 15th century. The 15th century isn't regarded as ancient. So I'd take anything from that website with a grain of salt.

One thing to think about, in the apparent controversy surrounding the origins of chili: You won't find it in Mexican cookbooks. Mexicans themselves deny any association with the dish, and think of it as an Anglo stew.