Widely considered the greatest racehorse of all time, which celebrated thoroughbred won the Triple Crown in 1973?

Secretariat's astonishing performance at the Kentucky Derby, the Preakness, and the Belmont Stakes broke time records at all three races — none of which have been surpassed since. America was captivated by the chestnut-coated stallion whom Vogue called the "Clark Gable of horses." Secretariat even made the covers of Time, Newsweek, and Sports Illustrated.

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