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For the current neutral city-states in the asteroid belt, the layout of their cities didn't depend on "city planning" but rather on where the various functional zones of the warship wrecks, initially built by refugees from the Jupiter domain that fled there, were placed.
The original city founders faced the biggest problem of fuel shortage when constructing the city. This group of city founders had escaped from the Jupiter domain, and while they included some martial artists, their numbers were limited. Just reaching here took them forty years.
Let's just say that this group of refugees set out because the Fourth Martial God's actions in the Jupiter domain had failed, leading to the complete suppression of all remaining forces of righteousness and bravery.
By the time they arrived, the Sixth Martial God had already fallen, and the cosmic storm stirred up by the Seventh Martial God had begun.