I suspect it may be a result of whatever left the world a desolate wasteland and created the Husks.
In dystopian fiction, there's often so me apocalyptic event. Nuclear war is common, but there's also the zombie apocalypse trope, often spread through infection. Sometimes it's a higher power, but such cases teeter closer to a dark urban fantasy than the light science fiction that accompanies most post-apocalyptic works.
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In dystopian fiction, there's often so me apocalyptic event. Nuclear war is common, but there's also the zombie apocalypse trope, often spread through infection. Sometimes it's a higher power, but such cases teeter closer to a dark urban fantasy than the light science fiction that accompanies most post-apocalyptic works.