[Espy]

Oh. So like, you know how in the early 1900s, the steel industry grew really, really fast? That industry was mostly funded by Andrew Carnegie, in Pittsburgh. And the banking system (as well as a lot of Edison's work) was funded by JP Morgan at around the same time, and Rockefeller has his oil companies up by then, too.

Cities sprung up to accommodate the ever-growing expanses of factories and plants, and Pittsburgh was one of these cities. So were Chicago and Detroit.

After that boom, a lot of the cities went downhill, but some cities did make a recovery, and you can see that in Pittsburgh and Detroit (although Detroit's obviously going downhill again, and a lot of people still think Pittsburgh is an industrial wasteland). Chicago never really declined much, haha...