In 1879, when the tracks to the Southern Pacific Railroad ran out, five overheated workers from Yuma dug their heels in the sand—and the community of Terminus, Arizona, was born. The three buildings they raised in the aridity of the high Sonoran desert were truly the “end of the line.” When the summer heat wave ended, the tracks from Terminus resumed to Tucson, and the micro-village grew into a small town. In a nod to local prehistory for the nearby Hohokam ruins—or perhaps to avoid christening the place as a future ghost town—railroad executives redubbed Terminus as “Casa Grande.” The town boomed as a railhead to mining prospects, but fires levelled the town center to cinders twice within a decade. When mining slowed in the 1890s, agriculture took over, and Casa Grande settled into itself, with a current population of about 48,000. True to its railway roots, Casa Grande is alternately referred to as the “crossroads” and “heart” of Arizona: smack at the intersection of the...