Horse racing in the United States has its own Hall of Fame in Saratoga Springs, New York. The Hall of Fame honors remarkable horses, jockeys, owners, and trainers. The traditional high point of US horse racing is the Kentucky Derby, held on the first Saturday of May at Churchill Downs in Louisville, Kentucky. Together, the Derby; the Preakness Stakes, held two weeks later at Pimlico Race Course in Baltimore, Maryland; and the Belmont Stakes, held three weeks after the Preakness at Belmont Park on Long Island, form the Triple Crown of Thoroughbred Racing for three-year-olds. They are all held early in the
American Quarter Horse hence the nickname. Horses listed in the appendix may be entered in competition, but offspring are not initially eligible for full AQHA registration. If the Appendix horse meets certain conformational criteria and is shown or raced successfully in sanctioned AQHA events, the horse can earn its way from the appendix into the permanent studbook, making its offspring eligible for AQHA registration. Since Quarter Horse/Thoroughbred crosses continue to enter the official registry of the American Quarter Horse breed, this creates a continual gene flow from the Thoroughbred breed into the American Quarter Horse breed, which has altered many of the characteristics