Tex-Mex" (combination of Texan and Mexican) is a term describing a regional American cuisine that blends food products available in the United States and the culinary creations of Mexican-Americans influenced by Mexican cuisine. The cuisine has spread from border states such as Texas and those in the Southwestern United States to the rest of the country. Tex-Mex is most popular in the Southern state of Texas. Tex-Mex is very different from the Southwest cuisine found in Arizona, New Mexico, Colorado, and Utah. In these areas, the preferred southwest cuisine is New Mexican cuisine. The southwestern state of Nevada and West Coast state of California tend to lie in the middle as far the preferred style of Mexican-American food. In some places, particularly outside of Texas, "Tex-Mex" is used to describe a localized version of Mexican cuisine. It is common for all of these foods to be referred to as "Mexican food" in Texas, parts of the United States, and some other countries.
Contributions by Kuru, WhisperToMe, and Xmike920.