Tom Kemp wrote in his blog the first genealogy published in America appeared in a newspaper 284 years ago - today – May 7, 1724. It appeared in the American Weekly Mercury. It was a genealogy of King Philip V of Spain. Genealogy articles routinely appeared in colonial newspapers.
You can read more at http://blog.genealogybank.com/2008/05/1st-genealogy-published-in-america-7.html.