The Fallout franchise is beloved for a lot of good reasons—it's got a timeless aesthetic, nukes are cool to look at when they aren't melting your flesh off, and the blend of post-apocalyptic Americana with radiation that's borderline indistinguishable from magic is pretty appealing...
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Todd Howard wants to preserve the 'Americana naivete' by keeping Fallout mostly based in the USA: 'keep the mysterious lands mysterious'
Source: PC Gamer (opens in a new tab)