Great Midwest Commonwealth

The  or Midwest Commonwealth was one of the thirteen commonwealths of the pre-War United States of America. Created in the early 21st century, it was comprised of the former states of Wisconsin, Minnesota, Illinois, Indiana and Michigan.

Illinois Wasteland
It seems that the Illinois Wasteland was conquered by Brotherhood of Steel deserters known as the Midwestern Brotherhood, although the exact amount of territory that they own is unknown. They led a harsh rule on the state. An Enclave outpost is also said to be located in the boundaries of Chicago.

Known places

 * Vault 1

Illinois Wasteland

 * Bunker Alpha (Fallout Tactics)
 * Bunker Beta (Fallout Tactics)
 * Bunker Gamma (Fallout Tactics)
 * Chicago (Fallout Tactics)
 * Dirt Haven (Fallout Tactics)
 * Freeport (Fallout Tactics)
 * Macomb (Fallout Tactics)
 * Peoria (Fallout Tactics)
 * Quincy (Fallout Tactics)
 * Rock Falls (Fallout Tactics)
 * Springfield (Fallout Tactics)

Wisconsin Wasteland

 * Appleton (Fallout Tactics)

Appearances
Places in the Great Midwest Commonwealth appear in Fallout Tactics, and were mentioned in Fallout: New Vegas and Van Buren. Additionally, it could very well be the setting of the Van Buren tech demo because of the presence of Armstrong, a corporal serving in either the 4th or 13th Great Midwest Commonwealth Armored Infantry Division.