Answer:
Native American were moved off their
land and into reservations
Step-by-step explanation:
When the westward migration was at its peak during the 1840s period. Many Americans moved to the western part of the United States.
This period led to the growth of the western population and innovations in farming and ranching. Eventually, the impact this mass western migration has on Plain Indians is that it caused Native Americans to be moved off their land and into reservations.