The self-destruction of all nations ended when the Great Whump silenced all of creation.
Life would, in time, find a mode of existence once more, with forces beyond common understanding pushing the living back to the surface of the world. The full after effects remain unkown, and may never be known, as many evolutions, mutuations, and genetic alterations have continued to occur across the world.
Theories theorize it may have originated from a bad taste in music.
All we know truly is the, one day it all went "Whump".