<human>:  What are the three races that make up the Triple Crown of Thoroughbred Racing?
<bot>: The three races are the Kentucky Derby, the Preakness Stakes, and the Belmont Stakes. The Kentucky Derby is the first leg of the Triple Crown, and is the longest of the three races. It is held in Louisville, Kentucky, and is the first of three legs of the Kentucky Derby. The Preakness Stakes is the second leg of the Triple Crown, and is held in Baltimore, Maryland. The Belmont Stakes is the third and final leg of the Triple Crown, and is held in Elmont, New York.