User blog comment:Sorairo/Comparisons and World Building….and Questions/@comment-9090085-20141009081003/@comment-24.31.13.227-20141010040655

Ah yeah. Blue Gender does kind of come to mind. I tend to go with the assumption that mankind wasn't really that established before the Grimm came, though. So like...mankind was still kind of undeveloped and roaming around like nomads maybe with small towns here and there to guard against Grimm. But the discovery of Dust allowed for rapid expansion once the Grimm could be controlled. This makes the Grimm a threat that's been there forever and not really like a population control enacted by some entity.

So it's more like light and dark have been holding each other in balance and, for a while now, the scales have been gradually tilting in light's favor.