Is war inevitable? Since war, like murder, has been historically unavoidable, is

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War
Is war inevitable? Since war, like murder, has been historically unavoidable, is war something to be accepted, anticipated, and dealt with as a fact of human nature? Or is war is becoming less frequent and less destructive globally, suggesting it is more natural to cooperate than fight for self-interest. I distinguish between local ad hoc conflict between individuals (you took my sandwich) and small groups (y'all took our sandwiches), not under consideration here. I am talking about extended, global, fatal combat between states and beliefs. A second question inevitably follows: does the development of military power inhibit war or invite it? I suppose your answer will clarify when war is war and when it is not quite war.