The United States faced many problems immediately following the Vietnam War, but perhaps the greatest was that returning Veterans were very traumatized and found it difficult to find jobs.
It was the "B. Plebeians" who made up the majority of the roman population and became citizen-soldiers during the time of war, since these were the "common" people as opposed to the elite.
Japan had instantly made enemies of all of Russia's allies. If your friend beat you up you wouldn't want to be his friend for a while and all of his friends may not like you after the fight.
