Plains tribes were inland tribes.
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The Bureau of Indian Affairs was created to settle or manage Native American issues. As the United States expanded toward the Pacific Ocean, skirmishes with Native Americans happened very frequently and a special government body was created to develop new ways to deal with the problem.
manifest destiny expanded american borders achieving the dream of becoming an ocean to ocean country
1783 was the date of the Treaty of Paris which officially separated the 13 American colonies from Great Britain. At that time the eastern border of what would be called the United States was delineated by the former colonies that had a coastline with the Atlantic Ocean. At that time all of the 13 colonies had a water access route to the Atlantic Ocean.
They discovered how large the continent was, and made it to the Pacific Ocean and back. They met many native american friends, and discovered hundreds of new species of animals. They created an open door to begin expanding the United States westward.