War is a part of human history that rolls into pre-human times. It's impossible to remove it from history and try to speculate about the results. It would be li

War is a part of human history that rolls into pre-human times. It's impossible to remove it from history and try to speculate about the results. It would be like trying to remove pairing or family ties from the equation. In any case, war is what causes things like the dark ages. When the way to gain wealth is to steal it, it doesn't pay to create and people stop. When exchanges between groups are generally violent, all other contact such as trade and cultural exchanges stop. The way violence has been kept at bay enough to let civilisation advance has been violence. Empires which are a big centralized ball of violence were usually how civilisation happened because they provided a big enough sphere within which war was minimal. Islands of relative peace.