|The following is based on Van Buren and has not been confirmed by canon sources.|
Most of Salt Lake City and Ogden, Utah, were destroyed during the Great War in 2077. When Vault 70 opened in 2190, the residents used their three G.E.C.K.s to found the city of New Jerusalem, based within the remaining ruins of Salt Lake City.
New Jerusalem's prophet and apostles repeatedly voted to have no commerce with outsiders from other, failed communities, refugees, or tribals. In 2233, a number of angry tribals, raiders, and disassociated attackers ganged up on New Jerusalem's defenders, sacked the settlement in the process, and killing most of the Mormons that did not flee, or attempted to flee.