I don't know if American Indians are a good example. The dynamic I am purposing assumes a longer elapse of time. The American Indians were faced with a situation that was extremely compressed while other primitive societies had a thousand years to convert from HGS to farming. Lets take the Goths for example. The Goths raped, pillaged and burned across the Roman Empire, becoming exposed to indoor plumbing, comfortable dwellings, tasty farm goods, along the way, and over the centuries they went from maurders of the Caucus into gentile manor landlords in France. If we look at American Indian societies that had longer and more gradual exposure to white society such as those who lived on the periphery of the Spanish empire, we find societies that were going thru revolutionary change, like the Commanche, whose society changed from top to bottom because of the horse, and caring for large herds of horses for the purposes of trading them is the beginning of agricultrual. Perhaps if the Utes had had the same kind of gradual exposure, they too may have found some innovation of another societiy that forced them to develop means of production in order to obtain it or produce it themselves. In fact, I did read an interesting study that compared the societal evolution of the Apache, who were much more isolated from both the Spanish and the English-speaking Empires, and how one society, the Comanche became more advanced and more what we would call civilized, while the other were virtual cave men right up to the 20th Century. The Apache had strong societal taboos against strangers and dealt with trespassers only one way - death. They were a society that discouraged any interaction with foreigners. I'll try to see if I can find it, it might offer you some insight.