Shown in the print above…
…Union Course was a horse racing course in what is now Woodhaven, Queens, in New York City. It hosted some of the most famous horse races in American history, including the 1823 match between American Eclipse and Sir Henry. The track was located between what are now Jamaica Avenue on the north, Atlantic Avenue on the south, 78th Street on the west, and 85th Street on the east.
https://en.wikipedia.org/wiki/Union_Course
1873 Map of Woodhaven, Town of Jamaica, Queens County

An article in the November 1888 Wallace’s Monthly writes of the end of the race course…
And by 1891, the race course is off the maps with its site now laid out with strrets ready for new homes to be built…

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