United Nations,
This country, built by the consolidated power of the entire world, uses the Solar System as a reference, and has established nine major cities*.
All immigrants and subsequently born humans are concentrated in the urban areas.
*As the nation gradually stabilizes, the nine major cities will be expanded, in the interest of ensuring safety. It's even possible to build satellite cities around them, such as Moon City next to the Capital.
Even though the urban areas are already huge, they occupy no more than 20% of the national territory, with most of the area still classified as the "outskirts."
Although the nation has invested enormous efforts in laying out "full-coverage circuits" and planting a large number of genetically modified luminescent plants to increase the visible light in the outskirts, it is still difficult to achieve nationally qualified levels of light.
