I came across a fascinating article that details the history of McKeesport. As I'm sure many of you know, McKeesport used to be a vibrant, bustling blue collar city, and the heart of the Mon Valley. This article details the factors that led to McKeesport's decline -- the opening of Eastland Mall in the 1960s, a massive fire that destroyed several downtown blocks and historic landmarks in 1976, and finally the loss of steel industry jobs in the 1980s. McKeesport wasn't able to recover from these blows. As late as 1976, McKeesport still had major retail and department stores, movie palaces, and daytime shoppers and office crowds, much like downtown Pittsburgh today.
You can read the article here: "Remembering the Tube City"
Here you can read about the famous fire that gutted downtown McKeesport in 1976 (and was a major event in the city's decline): "The Famous Fire"