It has been argued that the United States was not formed by European emigrants but that the Europeans settled the continent as it was sparsely populated by barbaric nomadic tribes who had little interaction with the Europeans. Thus the land was a wild frontier open to any who would claim it. The few Indians present did not comprise a civilization so no immigration could have taken place from one civilization to another. The Europeans were not immigrates entering already established nations, but settlers, a new people entering an undeveloped virgin land. This hardly the case and the idea stems from a lack of understanding of who and what the Native American Indians were and what they had accomplished before, during, and after the arrival of the Europeans.