"The Mississippi is the world’s longest navigable river, some 2,100 miles long from its mouth at the Gulf of Mexico to its head of navigation at the Twin Cities in Minnesota. That’s about one-third longer than the mighty Danube and triple the length of the Rhine. And the Mississippi is only one of twelve major navigable American rivers. Collectively, all of America’s temperate-zone rivers are 14,560 miles long. China and Germany have about 2,000 miles, France about 1,000 The entirely of the Arab world has but 120." The Accidental Superpower by Peer Ziehan, pages 46 and 47.
So, why's that important?