The document discusses the development of the American West in the late 19th century. It notes that while most felt the Great Plains could not be farmed, they were well suited for cattle grazing. This led to the establishment of vast cattle drives to transport Texas longhorns to railroads further north. The railroads, which saw significant expansion in the 1860s-70s, helped open up the Plains to farming through land grants and new technologies like barbed wire. However, this westward expansion displaced Native Americans and led to conflicts over land and assimilationist policies.