Nomads? Some of the tribes were nomads, but certainly not all.
1491: New Revelations of America Before Columbus by Charles Mann
He lays it on a little thick in some parts, but it paints a pretty decent picture of how different tribes lived before meaningful contact with Europe.
Given the technology and staple crops available to pre-contact Native Americans, many portions of the Americas were unihabitable for sedentary farming (read Guns, Germs and Steel by Jared Diamond for more on this fascinating subject.) The extinction of the nomadic and semi-nomadic tribes from the Americas is just one of few recorded examples of agricultural societies displacing hunter/gatherers. This same process occured almost prehistorically in Eurasia. Its always ugly when it happens. It is almost always a violent confrontation that results in the loss of life and liberty of the hunter/gatherers. Hunter/gatherers lacked the resources and man power to protect their claims to hunting rights against the onslaught of "homesteaders."
An insteresting book relevant to this subject is
The Scratch of a Pen: 1763 and the Transformation of North America (Pivotal Moments in American History) by Colin G Calloway. He shows that hunter/gatherer Indian tribes west of the Appalachins were powerful enough prevent settlers from expanding west of the Appalachins as long as the colonial powers of Great Britain and France were at war. These Indians were generally warlike people and, more important, were entrenched in the region, had a home field advantage, and easy access to fire arms through the fur trade. However, once England won, they consolidated their position and commited their military resources toward eradicating the Indians (even those allied to them against France in the French and Indian War) and moving settlers westward. So in this case it took the coercive power of the state to open up the frontier for settlement by "homesteaders." The United States continued this policy once it won independence and continued the expansion through the Great Plains and on to the west coast, which had already experienced heavy settlement by people of European descent.
It was not just the settlement of Latin America that relied on colonial power. North America was also conquered through aggression. Whether it was aggression against property rights or simply aggression against right to life and liberty, it was conquered one dead Indian at a time. Stranger, I hope you are not simply trying to write off the whole affair because you think some Indians didn't understand the concept of private property. Its a little more complex than that. The Indians who found themselves displaced (or in some instances, just plain killed) may not have understood your particular definition of property rights, but they did understand when a stranger was in their forest and they understood what was happening when "homesteaders" began chopping it down and building permanent settlements. I believe their response was appropriate.