page_title: Pittsburgh
section_title: 1800 to 1900
hierarchical_section_title: Pittsburgh / History / 1800 to 1900
caption_attribution_description: English: Lithograph showing bird's-eye view of the city of Pittsburgh, Pennsylvania from Mt. Washington. Shown are the Monongahela and the Allegheny Rivers; Birmingham is in the right foreground and Allegheny City is in the distance on the left. Numerous bridges, steamboats, factories.
context_page_description: Pittsburgh is a city in the state of Pennsylvania in the United States, and is the county seat of Allegheny County. A population of about 300,286 residents live within the city limits, making it the 66th-largest city in the U.S. and the second-most populous city in Pennsylvania behind Philadelphia. The Pittsburgh metropolitan area is the anchor of Western Pennsylvania, its population of 2,324,743 is the largest in both the Ohio Valley and Appalachia, the second-largest in Pennsylvania, and the 27th-largest in the U.S.
  Pittsburgh is located in the southwest of the state, at the confluence of the Allegheny, Monongahela, and Ohio rivers. Pittsburgh is known both as "the Steel City" for its more than 300 steel-related businesses and as the "City of Bridges" for its 446 bridges. The city features 30 skyscrapers, two inclined railways, a pre-revolutionary fortification and the Point State Park at the confluence of the rivers. The city developed as a vital link of the Atlantic coast and Midwest, as the mineral-rich Allegheny Mountains made the area coveted by the French and British empires, Virginians, Whiskey Rebels, and Civil War raiders.
context_section_description: The federal government has recognized Pittsburgh as the starting point for the Lewis and Clark expedition.
  The War of 1812 cut off the supply of British goods, stimulating American industry. 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. 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. By the 1840s, Pittsburgh was one of the largest cities west of the Allegheny Mountains. The Great Fire of Pittsburgh destroyed over a thousand buildings in 1845. The city rebuilt with the aid of Irish immigrants who came to escape the Great Famine. By 1857, Pittsburgh's 1,000 factories were consuming 22 million coal bushels yearly. Coal mining and iron manufacturing attracted waves of European immigrants to the area, the most came from Germany.
  While Pennsylvania had been established as a free state after the Revolution, enslaved African Americans sought freedom here through escape as refugees from the South, or occasionally fleeing from travelers they were serving who stayed in the city. There were active stations of the Underground Railroad in the city, and numerous refugees were documented as getting help from station agents and African-American workers in city hotels. The Drennen Slave Girl walked out of the Monongahela House in 1850, apparently to freedom. The Merchant's Hotel was also a place where African-American workers would advise slaves the state was free and aid them in getting to nearby stations of the Underground Railroad. Sometimes refugee slaves from the South stayed in Pittsburgh, but other times they continued North, including into Canada. Many slaves left the city and county for Canada after Congress passed the 1850 Fugitive Slave Act, as it required cooperation from law enforcement even in free states and increased penalties. From 1850 to 1860, the black population in Allegheny County dropped from 3,431 to 2,725 as people headed to more safety in Canada.
  The American Civil War boosted the city's economy with increased iron and armament demand by the Union. Andrew Carnegie began steel production in 1875 at the Edgar Thomson Steel Works in North Braddock, Pennsylvania, which evolved into the Carnegie Steel Company. He adopted the Bessemer process to increase production. Manufacturing was key to growth of Pittsburgh and the surrounding region. Railroad lines were built into the city along both rivers, increasing transportation access to important markets.
caption: Pittsburgh in 1874, by Otto Krebs
exif: {}