Final answer:
The Indian life in the Plains couldn't be the same due to the encroachment of settlers, disruption of buffalo migration, and government policies to confine them to reservations.
Step-by-step explanation:
The Indian life in the Plains couldn't be the same due to various factors. The encroachment of settlers on Native American land, disruption of buffalo migration patterns, and the government's desire to confine Plains Indians to reservations all led to significant changes in their way of life.
Plains Indians had traditionally relied on hunting and roaming, but the government wanted them to adopt a sedentary lifestyle and cultivate land like white settlers. This marked a major shift from their traditional way of life, causing hardships and conflicts with the settlers.
The introduction of horses to the Plains also transformed the culture of the tribes. They became efficient hunters and warriors, which changed their hunting techniques and social structures.