1860s: Western Nebraska & Kansas declared "public land" which opened them to homesteaders... Play with this section of the interactive map & do more research into Medicine Lodge Treaty (1867) & how designation of public land was actually used to privatize land...
1880s: The cash-strapped government financed RAILROADS by giving them public land. Resulted in pattern of westward expansion in which remaining public land is still in inaccessible patchwork.
Read this - re more legacies: American Indian RESISTANCE, 21st century. People dispossessed of "public" lands that are now controlled by feds so they can't use them. [do more research: who is the public when we say "public lands"?]