Chicago Inc. - Gears, Code and Blood
The US had long ago Balkanized over the course of a number of Civil Wars and the Native American awakenings. The flow of refugees from various conflicts has caused Chicago to sprawl upward and outward from the Lake in every direction.
Chicago has managed to resist falling under the control of any one faction by being too lucrative to blockade and too heavily armed to subdue. An independent city-state, Chicago maintain its independence through it’s own standing army which shares it hold on the city with a handful of mega corps.
The Army keeps order
The Corps keep money and supplies flowing in and out of the city.
The people keep the gears turning
You hustle to eek out survival somewhere in between