The Dust Bowl, a name that encompasses both a section of the Great Plains and a period of drought in the United States, was the greatest human-made ecological disaster in American history and one of the most devastating environmental disasters of the 20th century. During the 1930s, with the most severe period occurring between 1934 and 1935, 27 U.S. states—75 percent of the country—were affected by catastrophic droughts that deepened and exacerbated the deprivations and...