War and peace are two contradictory but complementary concepts. Indeed, there is no peace without war and vice versa. It is when two parties are at war that they need to make peace. To P. Proudhon, "Peace demonstrates and confirms war, war in turn is a demand for peace". Here are some principles about the issue. Rivalry and conflict, the foundations of war Conflict refers to a situation that opposes two people, two entities or even two countries. There is undoubtedly some sort of disagreement because...