History of Pittsburgh, Pennsylvania
Pittsburgh (IPA chart for English|pronounced {{IPA|[ˈpɪts.bɚg]}}) is the second largest city in the Pennsylvania|Commonwealth of Pennsylvania. It is the county seat of Allegheny County, Pennsylvania. Built on the land between the confluence of the Allegheny River|Allegheny, Ohio River|Ohio and Monongahela rivers and the surrounding hills, Pittsburgh features a skyline of 151 skyscrapers,[http://www.emporis.com/en/wm/ci/bu/sk/?id=101313 "High-rise Buildings of Pittsburgh"] 446 bridges[http://www.umc.pitt.edu/media/pcc/pittsburgh_cityofbridges_2006JUL10.html Pitt Chronicle: "Venice, Schmenice"], two inclines, and a pre-revolutionary fortification. Residents of the city are called Pittsburghers. The Downtown Pittsburgh|Downtown is a compact and walkable area located on the triangular land at the rivers' confluence.
Pittsburgh was fueled by the manufacturing industry until the 1980s when the United States steel industry collapsed. The city's economy is now largely based on healthcare, education, technology, and financial services.[http://www.city.pittsburgh.pa.us/co/assets/City_of_Pgh_CAFR_Final_2002.pdf 2002 Financial Statement] Retrieved on January 30, 2007. Robotics, in particular, is a major sector of the local economy; the Wall Street Journal dubbed the city "Roboburgh."
Despite a declining population,[http://www.rand.org/commentary/091904PG.html Rand Data] Pittsburgh remains the chief city of the eastern Ohio River Valley. Because of its low cost of living, economic opportunities, education, transportation and medical infrastructures, Pittsburgh is consistently ranked high in livability surveys. In fact, it was ranked "the most livable city in the United States" in 2007 by the Places Rated Almanac.[http://www.post-gazette.com/pg/07116/781162-53.stm Pittsburgh rated 'most livable' once again]
source Wikipedia