When was the last Triple Crown? A full list of winners

American Pharoah is racing to become the first Triple Crown winner since 1978 by winning the Belmont Stakes. Who are the others?

American Pharoah is racing to become the first Triple Crown winner since 1978 in the Belmont Stakes on Saturday.

After winning both the Kentucky Derby and the Preakness Stakes, American Pharoah entered as the favorite to take the third leg of the Crown. The horse would become the 12th Triple Crown winner in history.

American Pharoah was the third horse in the last four years to win both the Kentucky Derby and the Preakness. In 2012, I'll Have Another had a shot at the Triple Crown but was scratched the day before the Belmont due to tendonitis.

Last year, California Chrome won the Derby and the Preakness before finishing in fourth at Belmont. 

Here is the full Triple Crown winner history:

1919  Sir Barton 
1930  Gallant Fox 
1935  Omaha
1937  War Admiral 
1941  Whirlaway
1943  Count Fleet
1946  Assault
1948  Citation
1973  Secretariat
1977  Seattle Slew
1978  Affirmed