Union City is a large, well-fortified NCR town composed of primarily sandcrete dwellings and a handful of restored or re-utilized pre-War structures. NCR sharecroppers moved in to grow the GMO corn, but despite efforts to further modify it, it proved useless as a cheap source of ethanol. Nevertheless, the NCR quickly converted it into a frontier outpost in the next seven years, repairing the town's power and water infrastructure and fortifying it with a sandcrete wall. Afterwards, the NCR and the Survivalists signed a ceasefire, upon which the raiders were formally seen as a foreign power - leaving a ruined but now (mostly) peaceful city as the seat of the NCR's power in the Pass. Under the command of Juan Maxson-Elsdragon, the raiders attacked, then fled while setting fire to the cornfields, causing massive explosions which killed nearly a hundred NCR troopers and 38 NCR citizens. However, despite formally being taken by the NCR, the city continued to be contested by the Survivalists for the next thirteen years, finally culminating in one last major incident in 2253. Despite this, the NCR was able to capture the city, establishing a military presence in the area and liberating the raiders' slaves - among them William Silverman, who later joined the army and quickly rose through the ranks.

Their victory was not flawless the bloody Battle of Union City saw incredible casualties for the NCR Army. In 2240, the New California Republic, spurred by corporate interests in the GMO corn as a potential biofuel, conquered Union City. However, they quickly realized its relative uselessness as a food source and resorted to only using it for crude explosives. In the following centuries, as the Survivalist Raiders expanded out into the Pass, they reoccupied Union City and used it as a slave settlement, cultivating the mutant corn. Like much of the Cajon Pass, the soil was unable to support any other crops besides the modified corn and as a result, Union City became just another of the abandoned ghost towns that littered the desert. military installations, including one anti-missile radar site, Union City escaped the devastation that destroyed Los Angeles and San Bernadino proper relatively unscathed, but still fell victim to the lethal radiation and airborne FEV-2 that ravaged California. For unknown reasons, an inedible, highly explosive genetically modified form of corn designed for high-yield ethanol was grown in the surrounding farmland.Дespite being close to several prominent U.S. The town and all other properties in the pass were bought by Athens-Tec to house the company's workers.

In the pre-War world, Union City was a small desert town facilitating the trucking industry along Interstate 15.

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