I love to eat good tex mex food.
Oh me too.  It is a fusion of Mexican and American food styles
That's exactly why I like it so much!
I love that it gave us fajitas and chili con carne.  
Yeah I know, fajitas are the best.
I like a lot of Southwestern food in Arizona, New Mexico and Colorado as well
I've never been anywhere but I'm pretty near that region.
Mex has imported flavors from other spicy cuisines, such as the use of cumin, introduced by Spanish immigrants to Texas from the Canary Islands and used in Berber cuisine, but used in only a few central Mexican recipes. And in recent years Tex-Mex has incorporated elements of traditional Mexican food into the cuisine, including the more creative use of chile peppers and the serving of so-called "street tacos" (which would be simply called "tacos" in Mexico).
History.
The word "Tex
addition to flour tortillas. Dishes such as Texas-style chili con carne, nachos, crispy tacos, and fajitas, are all Tex-Mex inventions. 
Generally cheese plays a much bigger role in Tex-Mex food than in mainstream Mexican cuisine, particularly in the popularity of Chile con queso (often referred to as simply "queso") which is often eaten with chips (alongside or in place of guacamole and salsa), or may be served over enchiladas, tamales or burritos.
Moreover, Tex-