The document discusses the period of Westward Expansion in the United States and its impact on Native Americans. It contrasts the cultures of Native Americans and white settlers and explains how white settlers moved west and imposed restrictions on Native Americans. It describes several conflicts between Native Americans and settlers as the government pursued a policy of assimilation, trying to force Native Americans to adopt white American cultural ways through policies like the Dawes Act. It also discusses how the destruction of the buffalo herds decimated Native American populations and ways of life.