United States

By 2077, the United States of America were divided into zones, each of which consisted of several states. The number of stars on the new U.S. flag reflected the number of these zones instead of the old states. Only the name of one of the zones, the Great Midwest Commonwealth, was ever mentioned.

After the Great War, the remnant of the U.S. Government which survived at the Poseidon Oil Oil Rig in Pacific, became the Enclave.

Appearances in games
All Fallout games so far take place in the territory of the former United States.

Behind the scenes
The initial idea of dividing the contry into zones came from Leonard Boyarsky. In Fallout Bible 8 Tim Cain reported that Leon said he used that flag because it looked cool and he didn't want to use a standard American flag with 50 stars. Eventually he planned to make up something about 11 super-states or something, but he never did. It was further elaborated upon by J. E. Sawyer, who broke up the US into zones. Only the name of one of them is known so far, as it was stated in the Denver design document for Van Buren.

Inconsistency
Even though there are actually eleven stars on the new flag (one in the middle and 10 around it), not all of them are actually visible in the only available picture depicting the new flag. Because of that, Chris Avellone erroneously stated that there are 13 of them in Fallout Bible 8. he was corrected by Red, who sent him the picture with the location of all the unseen stars marked. However, apparently Josh Sawyer still believed there are thirteen of them, as he stated in the Denver design document that he actually broke up the U.S. into thirteen zones.

A possible explanation might be that 2 additional zones were added when Canada was annexed by the US, while the flag depicted in the above picture reflected the number of zones before the annexation.