Horses came to America from Spain, England, the Low Countries, and Arabia. Here they interbred and flourished as never before. "Out of the melting pot have come four entirely new breeds that rank among the finest horses of the world. Three of them originated through the painstaking and intelligent efforts of American horsemen, one through a freak of nature."That "freak" was a little bay stallion born when George Washington was president. This chunky, short-legged horse proved to be not only hardy and gentle but also able to outpull and outrun any other horse in New England or New York....