Thread drift but I think interesting: Pittsburgh is of course the point where two rivers, the Monongahela from the south and the Allegheny from north join to become the Ohio River. The French had explored and laid claim to the area in the early 1700’s. By 1750 they had defended this claim by building a fort at this point where the three rivers came together.
The British disputed this claim and sent the very young George Washington with some militia members to tell the French to leave. Long story short Washington’s trip was a disaster. Things turned violent, Washington and his band were captured, released, and slunk back to Virginia. The British responded by declaring war. Thus began the Seven Years War or to Americans the French and Indian War. This turned into a true world war the lasted throughout most of the 1750’s.
The British made at least two attempts to capture the fort; the first was the disastrous Braddock Expedition again including George Washington. The second, later in the war caused the French to abandon the fort as the British approached. The British rebuilt the fort named it Fort Pitt and settlers came over the mountains from the east to live nearby.
Thirty or so years later (the end of the American Revolution) Pittsburgh was the point from where settlers into the Ohio Country left, As the Ohio River was the easiest way into this new country, a business developed in Pittsburgh to build the primitive river craft to get them there.
I have also read that guns for Perry’s Lake Erie fleet were cast in Pittsburgh.
Roger