Peaceful human societies have existed for thousands of years without wars (North America).
That's utterly riduculous, Sava! There were plenty of wars in North American. The Iriquois and Hurons fought a number of wars before the white man came in. The Creek and Cherokee, the same.
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As for the question. Yes, war is justified, all the time actually, by the winner of the war. When the political costs of negotiation and diplomacy are greater than the poltical and economic costs of warfare, then warfare is even more justified.
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