Midwest

A home of radioactive cyclones.

Midwest refers to the former north-central states of the United States of America, specifically Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, Ohio, Nebraska, North Dakota, South Dakota and Wisconsin (the Plains Commonwealth and Midwest Commonwealth).

A little is known about this area:
 * Cassidy floats: I hear they got twisters miles wide in the Midwest. It's a big ol' radioactive dustbowl now.
 * Caesar's Legion pack encountered in Denver travells to the east (Kansas direction), where its new headquarter is located. The Legion pack appears there once a year. Then every couple of weeks a pair of fast guys scout out east, if the radioactive dust storms have subsided for the season. Once they do, they'll head out.
 * Anton, the leader of the non-NCR salvagers in Denver, is from the Midwest and fled to Denver to escape Caesar's Legion. So it could be possible to live there.