<P> 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 . </P>
what was the major factor in native american displacement
the incessant westward expansion of the United States