After 1800, the US government was decided to drive out American Indians westward.First they drive towards the river ​Mississippi and then to west.
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     The Plains Indians listed above were settled on a wide stretch of rolling plains places between the Rocky Mountains, the 98th meridian, Canada, and Texas.  Several tribes dotted states such as Nebraska, Minnesota, Montana, Oklahoma, and Texas, though conditions were rough.  Approximately 75,000 Indians inhabited the Plains in the mid-1800s.  
     The buffalo was depended on by the Plains Indians; it was vital that these were chased and hunted for necessary supplies such as food, shelter, and tools.  In the 1500s, America was introduced to horses.  The Spanish had brought them.  These were also useful in transportation and  buffalo hunting.