Pittsburgh is an industrial city and inland port where the Allegheny and Monogahela meet to form the Ohio River in Pennsylvania, USA. Pittsburgh dates its history as a town from 1764, when its first streets were laid out. Previous to this time it had been a military station under the name of Fort Pitt (built by the British), and still earlier between 1755 and 1758 was the scene of a struggle between England and France for its possession, the French having founded Fort Duquesne here in 1754. Pittsburgh was incorporated as a city in 1816. In 1845 it was struck by a disastrous fire in which $5,000,000 worth of property was destroyed.