[Redcloak]

My anthropology teacher said that warfare is something agricultural people do. It makes sense. A hunter-gatherer, while he may have a few favorite spots, can hunt or gather anywhere. If he's chased out of a particular area by others, he can still feed himself. A farmer, on the other hand, is tied to a piece of ground until his crops are in. If the farmer is chased off of his land, he'll starve. He has to defend a stationary asset in order to survive. This, understandably, makes the agriculturalist and his neighbors more prone to violence. They learn quickly that they may have to fight if they want to eat. And they eventually learn that warfare not only defends a field, it can get new ones.