American horses are icons. Mustang. Appaloosa. Morgan. Quarterhorse. Even their names suggest a timeless power. Horsepower that shaped a nation. A nation whose demands shaped them. Each has a unique story to tell. Born of legendary historical moments, charismatic figures, and singular places, American Horses takes us on a journey tracing the emergence of these breeds over time. But the work to understand, create, and maintain their legacies is not over. Today’s horse trainers are as diverse as the horses they care for. Their passion is unbridled – for they continue in the long tradition of innovation and husbandry that is now part of the very fabric of America. Narrated by Bill Pullman.