Wagering on horse racing is legal in many states and remains one of the most popular forms of betting in the United States. People have gambled on horses since before the colonies separated from England, and the Kentucky Derby and the race for the Triple Crown are among the nation’s most watched sporting events each spring. With many states allowing legal horse racing and betting, including Off Track Betting (also known as OTB), more people than ever have the opportunity to wager on horses.