In the early 20th century, the big four sports were a thing of the future and the big three comprised boxing, baseball and horse racing.
Somewhere along the way, a combination of anti-gambling sentiment and World War II diminished horse racing's popularity until the 1970s, when horses like Secretariat made legends and won the Triple Crown.
Since 1978, when Affirmed won the Triple Crown, no horse has completed the task. Horse racing has not received coverage on ESPN or other sports channels except for the big races. Unless one is at the racetrack, it is easy to forget horse racing is even a sport in America.
And yet nearly 170,000 people attended the Kentucky Derby just over a week ago—an all-time record.
Horse racing is coming back in America.