Board Thread:Speculation House/@comment-4830106-20131101010653/@comment-11188061-20131103155750

That already happened once, I think. I speculated in previous theories that once upon a time, the Humans and Faunus lived in harmony with each other. At the end of the Grimm War however, the two races became separated from each other, and because the Grimm infested almost all of Remnant they lost all contact with each other.

When the two races had finally reunited, whatever bonds they once held were all gone to dust. It was a new beginning, and unfortunately, it had not started well.