Expansion of European-American populations after the American Revolution resulted in increasing pressure on Native American lands, warfare between the groups, and rising tensions. Government officials thought that by decreasing the conflict between the groups, they could also help the Indians survive.Remnant groups have descendants living throughout the South.They settled first around present-day Queen Charlotte Islands, British Columbia, from where they migrated into Alaska and northern Canada, south along the Pacific Coast, and into the interior.They were the earliest ancestors of the Athabascan- speaking peoples, including the present-day and historical Navajo and Apache.Donec ullamcorper nulla non metus auctor fringilla.[/quote] Pellentesque ornare sem lacinia quam venenatis vestibulum. Native Americans in the United States are the indigenous peoples in North America within the boundaries of the present-day continental United States, parts of Alaska, and the island state of Hawaii.
People did not live there year round, but for the summer to hunt and fish, and to gather food supplies for the winter. The Oshara Tradition people lived from 5500 BCE to 600 CE.
They carried out strong resistance to American incursions in the decades after the American Civil War, in a series of "Indian Wars", which were frequent up until the 1890s. forced a series of treaties and land cessions by the tribes and established reservations for them in many western states. Pre-Columbian Further information: Settlement of the Americas, Paleo-Indians, and Pre-Columbian era map showing the approximate location of the ice-free corridor and specific Paleoindian sites (Clovis theory).
The coming of the transcontinental railroad increased pressures on the western tribes. According to the still-debated Settlement of the Americas, a migration of humans from Eurasia to the Americas took place via Beringia, a land bridge which formerly connected the two continents across what is now the Bering Strait. Falling sea levels created the Bering land bridge that joined Siberia to Alaska, which began about 60,000 – 25,000 years ago. The minimum time depth by which this migration had taken place is confirmed at 12,000 years ago, with the upper bound (or earliest period) remaining a matter of some unresolved contention. These early Paleoamericans soon spread throughout the Americas, diversifying into many hundreds of culturally distinct nations and tribes. The North American climate finally stabilized by 8000 BCE; climatic conditions were very similar to todays. This led to widespread migration, cultivation of crops, and subsequently a dramatic rise in population all over the Americas.
The Na-Dené people entered North America starting around 8000 BC, reaching the Pacific Northwest by 5000 BCE, and from there migrating along the Pacific Coast and into the interior.
Linguists, anthropologists, and archeologists believe their ancestors comprised a separate migration into North America, later than the first Paleo-Indians.