distance of 800 to 900 metres horse racing history?

Answer 1

From web site:

"In the United States, races can occur on flat surfaces of either dirt or grass, generally thoroughbred racing; other tracks offer quarter horse racing and harness racing, or combinations of these three types of racing. Racing with other breeds, such as Arabian horse racing, is found on a limited basis. American thoroughbred races are run at a wide variety of distances, most commonly from 4.5 furlongs (905 m) to 1½ miles (2414 m); with this in mind, breeders of thoroughbred race horses are able to breed horses to excel at a particular distance"

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