"There was a war" is kind of a gloss over an important event. That's the extent of what I remember too, which is pretty little in terms of worldbuilding. Wars are wounds on the psyche of culture -- we know what the treatment was, but we don't know what cause inflicted the damage. I guess I'll go watch and see if had more detail.
"Kitto daijoubu da yo." - Sakura Kinomoto