Shoes are mounted on fence posts along 1804 as the sun sets over Williston, N.D., Oct 1, 2013. Williston is in the heart of the bakken shale formation. In 2008 the North Dakota oil boom started its ongoing period of extraction of oil from the Bakken formation. Shale gas reserves has given the United States more independence over other nations such as Venezuela and countries in the Middle East. Photo Ken Cedeno (Photo by Ken Cedeno/Corbis via Getty Images)
