Pittsburgh

Pittsburgh is a southwestern Pennsylvania city situated where the Allegheny and Monongahela rivers join to form the Ohio River. The convergence creates a triangular downtown district known as the Golden Triangle. Yellow steel spans cross these waterways, earning the community its popular title as the City of Bridges.

The Cathedral of Learning rises to 163 m (535 ft) on the University of Pittsburgh campus as a Gothic Revival educational tower. The Andy Warhol Museum preserves extensive collections of pop art prints and films by the native Pittsburgh artist. Phipps Conservatory and Botanical Gardens displays tropical flora inside a Victorian glass greenhouse constructed in the 1890s. The Pittsburgh Steelers football franchise has won multiple national championships since joining the professional league in the 1930s. Physician Jonas Salk developed the first effective polio vaccine during the 1950s while conducting university laboratory research.

United States Steel produces durable flat-rolled sheet coils and seamless tubular pipes for heavy infrastructure projects. PPG Industries manufactures protective coatings and automotive paints. The Kraft Heinz Company produces bottled tomato ketchup and packaged condiments. Duolingo designs digital language-learning software and standardized mobile proficiency exams. The Port of Pittsburgh transfers bulk barge shipments of metallurgical coal, crushed gravel, and industrial chemicals along the navigable river network. Intermodal freight terminals transfer these raw materials to train corridors linking industrial plants across the Ohio Valley.

General John Forbes captured the French stronghold of Fort Duquesne in 1758 and named the outpost Pittsburgh to honor British statesman William Pitt. Britain erected Fort Pitt at the confluence in the 1760s to protect the western frontier. River shipyards constructed wooden flatboats and barges along the banks during the 1790s to supply expeditions down the Ohio River. The settlement expanded through iron smelting and glassmaking before Pittsburgh received its city charter in 1816. Extensive bituminous coal deposits fueled blast furnaces throughout the late 19th century, turning the river basin into the primary steelmaking region of the continent.