How did ancient Pueblo Indian farmers survive in the American Southwest when drought all but prevented agriculture? In 1971, archaeological research began on one of these commonly hypothesized but least actually known survival strategies. The area: Northern New Mexico; the people: one of the least studied, those of the Gallina culture; the time: the 1200s when extended drought drove people south out of Mesa Verde, Chaco and the Four Corners area (southwestern corner of Colorado, southeastern corner of Utah, northeastern corner of Arizona, and northwestern corner of New Mexico) in general...