Write an interesting and detailed backstory+lore  for the American web series RWBY in the form of a history book chapter, which explains how the world was divided into the Kingdoms of Mistral [located in Asia and based on the Great Qing Empire and the Han Ming dynasty before it], Vale [based in Canada and mostly based on the British Empire], Vacou [located in Arabia and inspired by the Caliphate] and Atlas  [located in the Intermarium countries of Eastern and Central Europe and based on the Third Reich] after the nuclear apocalypse caused by WWIII, how Dust was formed in the wake of the nuclear apocalypse and why the Gods came back to Earth when Man was rebuilding from the atomic war.


Explain also, how the creatures of Grimm were formed and how man was able to defeat them and reestablish civilization in the ruins of the nuclear conflict.


Also clarify how humans and faunus were able to use Aura and semblance while recovering from the nuclear war, and expand on the origin of each and every kingdom we see and hear about in RWBY.


The origin of Faunus and how man and Faunus came into conflict, should also be explored as well.


Also explain why the Kingdoms are called Kingdoms, even after the nobility and aristocracy have been long deposed by the time the students of Beacon are born. 
