Fortune | SupplyChainBrainAbout a hundred years ago, the United States reached “peak horse.” In 1920 some 25 million horses roamed the plains, boulevards, cul-de-sacs, rodeos, stockyards, ports, farms, and dingy alleys of America — toting freight, plowing fields, fighting wars, carrying passengers on buggy rides, and making a complete mess. May 29, 2018