Maxson (state)

Maxson is mentioned one of the states of the New California Republic. Nothing else it said about it in any of the games, but guessing from the name, it must have something to do with the Brotherhood of Steel, since Roger Maxson was the founder of the Brotherhood and its first High Elder. His son and grandson were High Elders after his death. Since there is evidence that the Brotherhood of Steel itself was not a member of the NCR, it can be assumed that it's probably a town built around or near the Brotherhood's Lost Hills bunker, with people living there under the Brotherhood's protection. It must have been built after 2241, since no such town could have existed during Fallout 1.

Appearances in games
The Maxson state does not appear in any of the Fallout games, but is mentioned in the NCR History Holodisk in Fallout 2. According to the leaked information about Black Isle's Falout 3 project (Van Buren), a place called Maxson's Bunker was to appear in that game. If it were the same place as the aforementioned state, it must have been located in the American southwest, since that's where the game took place.