As the floodwaters brought by Hurricane Harvey last week recede and new hurricane Irma moves slowly toward the Eastern U.S., it might be edifying to review how millions of Americans, despite federal anti-flood efforts, came to live and work in hazardous to dangerous flood-prone areas. The foundation of the current disaster traces back at least to the late 1920s under Republican interventionist Herbert Hoover. In 1927, a very destructive flood occurred along the Mississippi River. Secretary of Commerce Hoover’s relief campaign greatly increased the power of the U.S. Army Corps of Engineers to...