is a in the of Pennsylvania in the and the county seat of Allegheny County.

The developed as a vital link of the Atlantic coast and Midwest, as the mineral-rich Allegheny Mountains led to the being contested by the French and  empires, Virginians, Whiskey Rebels, and Civil raiders.

has transformed into a hub for the health care, education, and industries.  is a leader in the health care sector as the home to large medical providers such as University of Medical Center (UPMC).

The area is home to 68 colleges and universities, including research and development leaders Carnegie Mellon University and the University of . Google, Apple Inc., Bosch, , Uber, Nokia, Autodesk, Amazon,  and IBM are among 1,600 firms generating $20.7 billion in annual payrolls.

The area has served as the long-time federal agency headquarters for cyber defense,  engineering, robotics,  research and the nuclear navy. The nation’s fifth-largest bank, eight Fortune 500 companies, and six of the top 300 U.S. law firms make their global headquarters in the area, while RAND Corporation (RAND), BNY Mellon, Nova, , Bayer, and the National Institute for Occupational Safety and Health (NIOSH) have regional bases that helped become the sixth-best area for U.S. job growth.

is located in the of the , at the confluence of the Allegheny River and the Monongahela River, forming the Ohio River is known both as “the Steel ” for its more than 300 steel-related businesses and as the “ of Bridges” for its 446 bridges. The features 30 skyscrapers, two inclined railways, a pre-revolutionary fortification and the Point State Park at the confluence of the rivers.