Ken Burns’s previous documentary, “Prohibition,” was about America going dry — figuratively. “The Dust Bowl,” which airs Sunday and Monday nights on Channel 2, is about the Great Plains going dry — literally — and blowing away. Parts of Texas, Oklahoma, Kansas, Colorado, Nebraska, and the Dakotas became known as the Dust Bowl during the 1930s, the result of decades of overfarming and protracted drought.
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