The only thing certain about the origins of chili is that it did not originate in Mexico. Charles Ramsdell, a writer from San Antonio in an article called San Antonio: An Historical and Pictorial Guide, wrote:
"Chili, as we know it in the U.S., cannot be found in Mexico today except in a few spots which cater to tourists. If chili had come from Mexico, it would still be there. For Mexicans, especially those of Indian ancestry, do not change their culinary customs from one generation, or even from one century, to another."
If there is any doubt about what the Mexicans think about chili, the Diccionario de Mejicanismos, published in 1959, defines chili con carne as (roughly translated):
Source : http://whatscookingamerica.net/History/Chili/ChiliHistory.htm“detestable food passing itself off as Mexican, sold in the U.S. from Texas to New York.”