Pitts·burgh 
(pĭtsbûrg′)
(pĭtsbûrg′) A city of southwest Pennsylvania at the point where the confluence of the Allegheny and Monongahela Rivers forms the Ohio River. Fort Duquesne was built on the site by the French c. 1750 and fell to the British in 1758, when it was renamed Fort Pitt. The village surrounding the fort grew rapidly after the opening of the Northwest Territory. The city today is highly industrialized.
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