<P> Horse racing in the United States dates back to 1665, which saw the establishment of the Newmarket course in Salisbury, New York, a section of what is now known as the Hempstead Plains of Long Island, New York . This first racing meet in North America was supervised by New York's colonial governor, Richard Nicolls . The area is now occupied by the present Nassau County, New York, region of Greater Westbury and East Garden City . </P> <P> Horse racing remains a popular sport throughout the United States . </P>

When did horse racing start in the united states