Im almost positive its the south. :)
The appropriate response is Valley Forge. It was not the best place to set up winter camp for the Continental Army, as it was not able to shield southern Pennsylvania at the time. This area additionally left the defenseless under-provided armed force in the striking separation of the British, who were very much provisioned and secured in Philadelphia.
Usually it is the invasions and communism
Shell shock is basically PTSD and it was thought to be caused by soldiers being exposed to explodeing shells
You're off by a few there lol :D Earth is actually 4.54 billion years old.