The dictates of commerce made it inevitable that a major city would be established near the base of the Mississippi River. But, in the words of historian Ned Sublette, it was “a terrible place to build a town.”4 New Orleans has the lowest elevation of any major U.S. city, and with 41 percent of the continental United States’s runoff flowing down and through the Mississippi, the Crescent City is to America what plumbing pipes are to your home. Tropical storms are frequent visitors, brushing by or making a direct hit once every three or four years on average, and any resident who lives to middle
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