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The dry, sunswept American Southwest stretches from the western border of Texas to Barstow, California (about 950 miles along I-40), extending south to the Mexican border and as far north as Grand Junction, Colorado. Geographically, the region is defined by rugged hill country and arid deserts. Since the ‘60s the population in this region has doubled, and continues to rise 13 percent annually, making it the fastest growing area in the U.S.