What were the primary factors pressuring Indian nations during this period How did Indians respond to these pressures?

During the period of European colonization and westward expansion in the 19th century, Indian nations faced significant pressures from land encroachment, military conflict, and cultural assimilation efforts by settlers and the U.S. government. These pressures led to forced removals, such as the Trail of Tears, and conflicts like the Indian Wars. In response, many Indian nations sought to resist through armed conflict, while others attempted to adapt by negotiating treaties, forming alliances, or adopting new ways of life, such as farming and education, to coexist with European settlers. Despite their efforts, many faced significant loss of land and sovereignty.