Jose Maiorino

War will be always with us, unless we revert to a hunter/gatherer system.
Early man migrated following the seasons and the migrations of their prey. Tehy had no concept of ownership, other than their families. Maybe there were tussles when disputing the occupancy of a cave, but that was the extent of it.
Native americans of the whole continent did not have a sense of ownership. The world that they knew, together with the plants and animals, were a gift from God. And they were caretakers. They were renters, not owners.
When humankind started farming the value of owning the land they tilled was, for the first time, important.
The Mayas and Aztecs had a system, call it theocracy, in which they owned all the land. Farmers were allowed to farm, but they had to pay a TAX. In their case was in goods, since money was not yet invented.
So there you have it: land ownership and taxes. You would have to eliminate both to avoid another war. Not a ikely prospect.