Black Horse Tavern was founded in 1794 by Henry Westbay, a native of Ireland. That year, during the early stages of the Whiskey Rebellion, the rebels met at the Black Horse Tavern to plan attacks on federal forces. Leaders of the rebellion intercepted federal mail between Philadelphia and federal troops at the tavern.
Some sources identify the Black Horse Tavern as the birthplace of the Whiskey Rebellion. Other sources are less certain on the role of the tavern in the rebellion, ascribing the tavern's prominent role in the Whiskey Rebellion to "local tradition." By 1795, Westbay opened a "nailing business" at the location. In 1814, he sold the tavern and moved to nearby Washington.
^Philip W. Goetz, ed. (1983). "Canonsburg". The New Encyclopaedia Britannica. Encyclopaedia Britannica. p. 517. "In 1794, the Whiskey Rebellion (an uprising of farmers against excise tax on distilled liquor) began there [Canonsburg] at the Black Hose Tavern."
^Herron, Jr., James T. (May 2000). "Canonsburg School Board Minutes, Nov. 3, 1910 and Jan. 3, 1911". Jefferson College Times. Jefferson College Historical Society. "In 1910 the Canonsburg school board accepted his [Dave McCartney] bid to tear down what was left of the old Black Horse Tavern. The school district was planning to build a high school on the site. He signed the proposal with his mark."