That's because we have a concept of property now. Hunter gatherers may have had territory in the same way that other predators do, but these were wide ranging and sparsely populated. Yes, fights would have happened when they encountered one another, but this would not have been a regular occurance. There would have been no need to decide to go and invade another's territory until yours became unable to support your growing clan.
Failing resources and a growing population, both possibly caused/facilitated (partly) by the onset of agriculture, were the kindling for invasions and war. Minor skirmishes with another wandering tribe don't really count.
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