The Ohio, Allegheny and Monongahela Rivers meet in Pittsburgh. Pittsburgh is a city located in the western portion of Pennsylvania. As of 2014, its population is approximately 305,841, making it the second largest city in Pennsylvania.
Pittsburgh was founded in 1758 as a frontier fort settlement and incorporated as a city in 1816. The city was named for Sir William Pitt. From 1890-1911 the city was spelled Pittsburg in accordance with rules set by the U.S. Board on Geographic Names. In 1991, it was restored to its original spelling.
Pittsburgh has several nicknames, including "Gateway to the West," "The Steel City" and "City of Bridges." As of 2014, the city has 446 bridges and 300 steel-related businesses.