This detail shows the beginning of white urbanization in the West– damming the rivers is what allows for large populations to live in the arid West. A U.S. Calvary Fort sits outside an early town site– allowing whites to settle on Natives’ land.. Modern energy sources start to show up in the form of modern day windmills and power lines from the dam. Notice the advent of the tractor in the 1930s which allowed mass farming. The ability for humans to plow up so much of the prairie, combined with economic and ecological tough times led to the greatest man-made disaster on this continent- the dust bowl. The tractor also enabled single families to make an agrarian living on a farm in the industrial age, and enabled us to feed many more people. As with most things, politics interfered with it all.