You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser.
alternatehistory.com
This is an alternate history where both Texas and Deseret are admitted in their full statehood glory. The rules are simple you can't give deseret or Texas any more land but you can't take away any land from them either. Any territories that weren't states before the treaty of Guadalupe Hidalgo are fair game.
Here is a map for reference
(Ignore the part of Deseret that's past Texas)