How did the growth of agriculture mining railroading and industry contribute to a change in federal Indian policy?

The growth of agriculture, mining, railroading, and industry in the 19th century significantly influenced federal Indian policy by increasing the demand for land and resources. As settlers moved westward, the U.S. government prioritized the expansion of infrastructure and economic development, often at the expense of Native American territories. This led to policies focused on removal, assimilation, and the establishment of reservations, as the government sought to facilitate resource extraction and settlement. Ultimately, these economic interests drove a shift toward more aggressive and often detrimental policies regarding Native American sovereignty and land rights.