Churchill Downs to help him run the rack was Col. Matt Winn of Louisville. Churchill Downs prospered and the Kentucky Derby then became the preeminent stakes race for three-year-old thoroughbred horses in North America. During that early period, a new clubhouse was built in order to promote social interaction, and new events such as steeplechases, automobile races, and band concerts were held at the track. The State Fair was held on the grounds, featuring the odd spectacle of two locomotives being intentionally crashed head-on in the infield. On June 5, 1907, African American jockey James Lee set a record that has never
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