Final answer:
The expansion of the population of the United States had a significant impact on the lives of Native Americans. Settlers encroached on their land, leading to conflicts and the government's relocation policies disrupted their way of life.
Step-by-step explanation:
The expansion of the population of the United States had a significant impact on the lives of Native Americans. As settlers moved westward, they encroached on Native American land, creating conflicts and tension between the two groups. The government's policy of relocating Native American tribes to reservations and assimilating them into Euro-American culture further disrupted their way of life. Native Americans faced displacement, loss of land and resources, and forced assimilation into mainstream society.