After the Civil War, the federal government actively promoted American industry and enacted policies that fostered expansion of the American West. The opportunity and prosperity enjoyed by some Americans as a result of these federal actions came at the expense of others. Native Americans found their homelands and their way of life under siege, and some immigrants encountered strong prejudice in their quest for the American dream. Within a few decades the federal government moved to reign in some of the excesses that its policies had permitted. Describe one of the policies meant to promote American industry or foster expansion of the American West.