what was the major factor in native american displacement
History of Native Americans in the United States In the 19th century, the incessant westward expansion of the United States incrementally compelled large numbers of Native Americans to resettle further west, often by force, almost always reluctantly. Native Americans believed this forced relocation illegal, given the Hopewell Treaty of 1785. Under President Andrew Jackson, United States Congress passed the Indian Removal Act of 1830, which authorized the President to conduct treaties to exchange Native American land east of the Mississippi River for lands west of the river.
History of North America The specifics of Paleo-Indians' migration to and throughout the Americas, including the exact dates and routes traveled, are subject to ongoing research and discussion.[1] For years, the traditional theory has been that these early migrants moved into the Beringia land bridge between eastern Siberia and present-day Alaska around 40,000 â€“ 17,000 years ago, when sea levels were significantly lowered due to the Quaternary glaciation.[1][4] These people are believed to have followed herds of now-extinct pleistocene megafauna along ice-free corridors that stretched between the Laurentide and Cordilleran ice sheets.[5] Another route proposed is that, either on foot or using primitive boats, they migrated down the Pacific coast to South America.[6] Evidence of the latter would since have been covered by a sea level rise of hundreds of meters following the last ice age.[7]