Tex-Mex is one of the best cuisines out there since you get the  best of American and Mexican!
Yes.  I have a friend who owns and Tex-Mex stand.  Do you also work in the business, or just one who loves to eat the food?
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-
Since the 20th century, there have been an interchange of food influences between Mexico and the United States. Mexican cooking was of course still practiced in what is now the Southwest United States after the Mexican–American War, but Diana Kennedy, in her book "The Cuisines of Mexico" (published in 1972), drew a sharp distinction between Mexican food and Tex-Mex.
Tex-Mex food was developed from Mexican and Anglo influences, and was traced to the late 19th century in Texas. It still continues