Canonsburg, borough (2020 pop.
8,672), Washington co., SW Pa., inc. 1802. Its steel and coal industries
have declined significantly. A gram of radium produced there was presented
to Marie Curie in 1921 when
she visited the town. The Log Cabin School (est. 1777; the first school west
of the Alleghenies) is preserved. The Black Horse Tavern was a famous
gathering place for leaders of the Whisky Rebellion (1794). Roberts House
(1804) is an example of W Pennsylvania manor architecture.
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