"Ecological problems probably also caused the Chaco people to abandon this valley. But had they survived and thrived and multiplied, would the Chacos and Hohokams and others like them have been the ancestors of today's Americans, instead of it being the immigrant nation it is today?"
"On the way out of Chaco, my rental Toyota's GPS device keeps telling me, in its metallic GPS way, to turn left here, or right there. Except that there's nowhere to turn; the instructions suggest paths that are non-existent. I mean, the contraption shows them on its display, and indicates I should turn, and says so loudly, but at those points where it urges me to do so, there is simply nothing to turn on to. Just bushes. Again, I am glad to later read People of Chaco, because Frazier explains that various aerial photography techniques have suggested that there was once a complex network of roads between the ruins and outliers in this area. Yet, he writes, it's impossible to locate some of those roads on the ground. Is this GPS thingie suffering from a similar problem, or in its case, delusions? After all, this is the only spot, through several thousand miles of driving, where it has offered me such oddball advice."
"Is it also responding to aerial views of ancient ancestral roads?"
(Dilip D'Souza in 'Roadrunner: An Indian quest in America,' p. 251 Harper)