Final answer:
American Indian tribes sought control over new lands primarily to preserve their traditional hunting grounds, economic interests, and establish permanent settlements. The clash with European settler's concepts of private land ownership and assimilation policies led to conflicts and loss of territory and culture for Native Americans. By the end of the 19th century, tribes were confined to reservations and faced poverty due to government negligence.
Step-by-step explanation:
The question relates to the reasons why American Indian tribes sought control over new lands, particularly during the 19th century when the United States expanded its territory. The motives behind the Native American efforts included the desire to preserve traditional hunting grounds, react to the economic opportunities through trade, and the need to establish permanent settlements. The formulation of early U.S. Indian policy was greatly influenced by the acquisition of land which was considered crucial, and this policy led to tribal lands being reduced and their traditional way of life being disrupted.
Interactions between the Native Americans and European settlers were initially driven by the Europeans' pursuit of economic gain, religious conversion, and territorial expansion. As settlers built houses, defined fields, and erected fences, the concept of private land ownership clashed with the natives' belief in communal land use, leading to significant conflicts and a gradual loss of control over their territories and way of life. Native American tribes were also coerced into assimilating into American society, which included changes to their appearance, language, and religious practices.