Coronado scorned this region as unpopulated when he labored through southeastern Arizona in 1540, but he could have found 12,000-year-old spear points in the remains of giant bison near Cave Creek Cienega, grinding hollows in boulders, and shamanic figures in high caves of the Chiricahuas towering above valleys and grasslands. Searing drought forced people to abandon their villages by 1400, but Apaches wandered down from Canada about the time Spaniards...