Uncontacted people, also referred to as isolated people or lost tribes, are communities who live, or have lived, either by choice (people living in voluntary isolation) or by circumstance, without significant contact with globalized civilization. Few people have remained totally uncontacted by global civilization. Indigenous rights activists call for such groups to be left alone, stating that it will interfere with their right to self-determination. Most uncontacted communities are located in densely forested areas in South America and New Guinea. Knowledge of the existence of these groups comes mostly from infrequent and sometimes violent encounters with neighboring tribes, and from aerial footage. Isolated tribes may lack immunity to common diseases, which can kill a large percentage of their people after contact.
a Yahi, is believed to be the last Native American in Northern California to have lived most of his life completely outside American culture. In the year 1911, he emerged from the wild near Oroville, California, leaving his ancestral homeland in the foothills near Lassen Peak.
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