Assertion: cowboy's horse | /r/CapableOf | develop on east coast
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text: Many breeds of horse make good stock horses, but the most common today in North America is the American Quarter Horse, which is a horse breed developed primarily in Texas from a combination of Thoroughbred bloodstock crossed on horses of Mustang and other Iberian horse ancestry, with influences from the Arabian horse and horses developed on the east coast, such as the Morgan horse and now-extinct breeds such as the Chickasaw and Virginia Quarter-Miler.