Midwest

As home of cyclones it should be territory of former the Plains Commonwealth – Nebraska, Kansas, Iowa, Missouri, Oklahoma former states, rather then former Midwest Commonwealth (Wisconsin, Minnesota, Illinois, Indiana, Michigan former states).

Cassidy floats: ''I hear they got twisters miles wide in the Midwest. It's a big ol' radioactive dustbowl now.''

The Legion pack encountered in Denver travells to the east, where the new Legion headquarter is located. Legion pack appears there once a year. Every couple of weeks a pair of fast guys out east scout, 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, home of the radioactive cyclones, and fled to Denver to escape Caesar's Legion. So it is possible to live there.