How to avoid civil war? Will there be a civil war in one day?

Civil war can't be avoided just because some people say it can be avoided. The emperor can't avoid it, because there are others who want to be emperors. After the civil war, there will be another civil war, and the unification and division of a country or the replacement of a dynasty are indispensable. Although people hate war, they have to get involved in it in some cases. Perhaps the slogan of both sides of the war is to fight for the happiness of the people of the whole country, and they all feel that they are good people and the other side is bad people.