McKeesport, Duquesne and Clairton are three of the 53 third-class cities in Pennsylvania that experienced challenges as the businesses they were built around crumbled in the industrial decline of the 1980's. As it winds southeast of Pittsburgh, the Monongahela Valley is punctuated with former steel cities and towns well past their industrial prime. Left now with dwindling number of residents and without the economic diversity of bigger cities, local governments are left spending more than their incoming tax revenue to support the public services, infrastructure, and government left to serve populations several times the current size.