Tenet Healthcare. Nationally, the Dallas–Fort Worth area, home to the second shopping mall in the United States, has the most shopping malls per capita of any American metropolitan statistical area. Mexico, the state's largest trading partner, imports a third of the state's exports because of the North American Free Trade Agreement (NAFTA). NAFTA has encouraged the formation of maquiladoras on the Texas–Mexico border. Culture Historically, Texas culture comes from a blend of Southern (Dixie), Western (frontier), and Southwestern (Mexican/Anglo fusion) influences, varying in degrees of such from one intrastate region to another. Texas is placed in the Southern United States by the United States Census Bureau. A popular food item, the breakfast burrito, draws from all three, having a soft flour tortilla wrapped around bacon and scrambled eggs or other hot, cooked fillings. Adding to Texas's traditional culture, established in the 18th and 19th centuries, immigration has made Texas a melting pot of cultures from around the world. Texas has made a strong mark on national and international pop culture. The entire state is strongly associated with the image of the cowboy shown in westerns and in country western music. The state's numerous oil tycoons are also a popular pop culture topic as seen in the hit TV series Dallas. The internationally known slogan "Don't Mess with Texas" began as an anti-littering advertisement. Since the campaign's inception in 1986, the phrase has become "an identity statement, a declaration of Texas swagger". Texas self-perception "Texas-sized" is an expression that can be used in two ways: to describe something that is about the size of the U.S. state of Texas, or to describe something (usually but not always originating from Texas) that is large compared to other objects of its type. Texas was the largest U.S. state until Alaska became a state in 1959. The phrase "everything is bigger in Texas" has been in regular use since at least 1950. Arts Houston is one of only five American cities with permanent professional resident companies in all the major performing arts disciplines: the Houston Grand Opera, the Houston Symphony Orchestra, the Houston Ballet, and The Alley Theatre. Known for the vibrancy of its visual and performing arts, the Houston Theater District—a 17-block area in the heart of Downtown Houston—ranks second in the country in the number of theater seats in a concentrated downtown area, with 12,948 seats for live performances and 1,480 movie