Daniel talks with John M. Barry, the author of "The Great Mississippi Flood of 1927 and How It Changed America" (Simon & Schuster). The 1927 flood - which stretched from Cairo, Illinois to New Orleans - left more than one-thousand people dead and 900-thousand people homeless. Throughout the flood plain there were camps set up to house the homeless - and conditions in these camps were bad. The worst camp was in Greenville, Mississippi - where blacks, says Barry, were essentially slave labor: They were not paid. They were not allowed to leave. Living conditions were poor.

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