Answer: b) that because of the demand for more resources, Americans kept moving west and displaced American Indians along the way
Explanation:
The two main reasons these battles occurred (especially Little Big Horn) was because the Americans wanted the resources that the Native Americans had on their reservations. In the case of Little Big Horn, Americans wanted the oil that was at their reservations. The Native Americans were upset with the Americans for wanting to take their land again, so they began to fight back against American troops.