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There have been wars over land since humans have existed. And non interaction, even if initially widespread, clearly eventually stopped when it became clear the world wasn't infinite and that particular parts had special value and were contested by multiple tribes. Australia being huge and largely empty didn't stop European tribes from having a series of wars increasing in intensity until we had WW1 and WW2, which were unfathomably violent and huge clashes over ideology and resources. This is what happened in Europe, where multiple tribes of comparable strength grew up near each other over a period of time. In America, settlers simply neutralized Native Americans while the settlers' technological superiority was overwhelming, a much better idea than simply letting them grow powerful enough to eventually challenge you.
You write as though the amount of free land or buffer zone was constant, that is, as though the world population was constant. My point t was that walking in separate directions was a more viable option when the population was much lower...that, where available, it is usually an attractive option because it is like cost. That's a probabilistic argument. The point is probabilistic. There have always been wars, the question is how many.
Do I really have to explain why Australia wasn't a buffer zone between European nations? On a planet, there is no guarantee... (read more)