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By 1815, Pittsburgh was producing significant quantities of iron, brass, tin, and glass.On March 18, 1816, the 46-year-old local government became a city.British General Edward Braddock was dispatched with Major George Washington as his aide to take Fort Duquesne.The British and colonial force were defeated at Braddock's Field.A 1769 survey referenced the future city as the "Manor of Pittsburgh".Both the Colony of Virginia and the Province of Pennsylvania claimed the region under their colonial charters until 1780, when they agreed under a federal initiative to extend the Mason–Dixon line westward, placing Pittsburgh in Pennsylvania.General John Forbes finally took the forks in 1758.Forbes began construction on Fort Pitt, named after William Pitt the Elder while the settlement was named "Pittsborough".
On April 16, 1771, the city's first civilian local government was created as Pitt Township.
It was served by numerous river steamboats, that increased trading traffic on the rivers.
In the 1830s, many Welsh people from the Merthyr steelworks immigrated to the city following the aftermath of the Merthyr Rising.
During this period, the powerful nations of the Iroquois Confederacy, based in New York, had maintained control of much of the Ohio Valley as hunting grounds by right of conquest after defeating other tribes.
By the terms of the 1768 Treaty of Fort Stanwix, the Penns were allowed to purchase the modern region from the Iroquois.-burg) is a city in the Commonwealth of Pennsylvania in the United States, and is the county seat of Allegheny County.As of 2017, a total population of 305,704 lives within the city limits, making it the 63rd-largest city in the U. The metropolitan population of 2,353,045 is the largest in both the Ohio Valley and Appalachia, the second-largest in Pennsylvania (behind Philadelphia), and the 26th-largest in the U. Located at the confluence of the Allegheny, Monongahela, and Ohio rivers, Pittsburgh is known as both "the Steel City" for its more than 300 steel-related businesses, and as the "City of Bridges" for its 446 bridges.Lord Jeffrey Amherst ordered blankets contaminated from smallpox victims to be distributed in 1763 to the tribes surrounding the fort.