Racing takes place mostly at weekends and there is usually one meeting on a Saturday and one on Sunday.harrahs casino hotels nearby SILVER STAR CASINO IN MISSISSIPPI Another form of horse racing is harness racing, in which the jockey rides in a small cart harnessed behind the horse. We’ll just be covering thoroughbred racing, since it’s the most popular version. Gambling Sites By Region. United States. Canada. Horse racing is an equestrian performance sport, typically involving two or more horses ridden by jockeys or driven over a set distance for competition. It is one of the most ancient of all sports and its basic premise – to identify which of two or more horses is the fastest over a set course or distance. Since then, horse racing has flourished as the sport of kings. In the modern day, horse racing is one of the few forms of gambling that is legal throughout In the United States, the most popular races comprise of Thoroughbred horses racing over flat courses between 3/4 of a mile and 1 1/4 miles.