As helping refugees from New Orleans continues, a few people are turning some attention to the long-term future of that City. Begin with this: there must be a new New Orleans. As I write this, New Orleans is flooding again, from the long distance effects of Hurricane Rita. There is a law of hydraulics that great masses of water can be controlled or channeled, but not absolutely stopped. This law is as inexorable as gravity. Thomas Jefferson understood the vital importance of the Mississippi River and the Port of New Orleans to the whole nation. Aaron Burr recognized the same...