Which economic factor contributed most to the motives for waging war against Native Americans during 1840 to 1890?

The desire for fertile agricultural land was a significant economic factor that contributed to the motives for waging war against Native Americans from 1840 to 1890. During this period, the United States experienced a westward expansion driven by the belief in Manifest Destiny, the idea that it was the nation's destiny to expand across the continent. Settlers and the government sought lands that were suitable for agriculture, as they recognized the potential for profitable farming in these areas.

The fertile plains and valleys, particularly in territories inhabited by Native American tribes, were seen as essential for the growing population and economy. The agricultural boom required more land, leading settlers to encroach upon Native American territories. This pushed Native communities into conflict with settlers and the government, as the latter sought to remove Native Americans from their lands to make way for farming and settlement. This economic motivation for land acquisition was a driving force behind military campaigns and government policies aimed at subduing Native populations and securing their lands for agricultural development.

Understanding this context highlights how economic aspirations directly influenced U.S. interactions with Native American tribes during this era.