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By 1797, glass manufacture began, while the population grew to around 1,400.
Settlers came via routes over the Appalachian Mountains or through the Great Lakes.
The French built Fort Duquesne based on La Salle's 1669 claims.
The French and Indian War, the North American front of the Seven Years' War, began with the future Pittsburgh as its center.
On March 8, 1771 Bedford County, Pennsylvania was created to govern the frontier.
On April 16, 1771, the city's first civilian local government was created as Pitt Township.
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.
By the terms of the 1768 Treaty of Fort Stanwix, the Penns were allowed to purchase the modern region from the Iroquois.Following the American Revolution, the village of Pittsburgh continued to grow.One of its earliest industries was boat building for settlers of the Ohio Country.The nation's eighth-largest bank, eight Fortune 500 companies, and six of the top 300 U. law firms make their global headquarters in the Pittsburgh area, while RAND, BNY Mellon, Nova, Fed Ex, Bayer and NIOSH have regional bases that helped Pittsburgh become the sixth-best area for U. Michael Bezallion was the first to describe the forks of the Ohio in a 1717 manuscript, and later that year European fur traders established area posts and settlements.During 1753–54, the British hastily built Fort Prince George before a larger French force drove them off.