Illinois

In the early 21st century, when the United States was divided into thirteen commonwealths, the old state of Illinois became part of the Midwest Commonwealth, along with Wisconsin, Minnesota, Indiana and Michigan.

After the Great War, there was little civilization left in the former Illinois, except for the towns of Springfield and Quincy in the southern part of the state. The majority of the human settlements in Illinois were either tribal villages like Brahmin Wood, Dirt Haven or Peoria, or raider camps like Freeport, Devil's Graveyard and Rock Falls.

The situation changed after the defeat of the Master and his super mutant army in the far West. The Brotherhood of Steel, a powerful California faction, constructed airships and dispatched them, to track down and assess to the extent of the remaining super mutant threat. However, a great storm broke the main airship and flung it far from its course. The mighty airship was badly damaged. The smaller sections were torn from the main craft and never to be seen again. The fraction of the crew that still survived, struggled to keep their ship aloft before finally crashing on the outskirts of the ruins of Chicago. The survivors eventually formed the Eastern Brotherhood of Steel, a new organization, which diverged greatly from the ideals of the old Brotherhood. In time, they established a harsh rule over the towns and villages in the area of Illinois.

Appearances in games
Only Fallout Tactics takes place in Illinois.