On June 22, 1897, the Edison Film Company recorded this horse race at the Sheepshead Bay Racing Track in Brooklyn, New York. The track was built by prominent businessmen in 1880 and was popular until Governor Charles Evans Hughes banned all racetrack gambling in the state in 1910. The track was eventually sold and an auto racing track was subsequently built. It eventually ran into financial troubles as well and the land was purchased by real estate concerns.
From what I can gather, there were nine horses competing in this 1897 race. A horse named Clifford, who was then approximately seven years old, was the heavy favorite and easily dispatched of his competitors.