Nanoha StrikerS

[Valles]

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If they switched from a tech based society to a magic based one only 70 years ago, they might just be shifting people around the city while they convert the area to a magic based infrastructure.

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That's a thought. Another one might be that Midchildia's capital had an infrastructure or industrial role that no longer applies under the new rules - like, why bother running a port when you've switched to using skyships or teleporters to deliver heavy goods right to their destination? So most of the jobs just went away, and the people followed. Later, the city government zoned people out of the sparsest districts to cut utility and maintenance costs, even as the TSA ground forces moved in and started becoming the major source of employment...
A neutron bomb during the wars would also work, I think, but I prefer the former view.
Ja, -n

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"I'm terribly sorry, but I have to kill you quite horribly now."