All wars, at the root, are fought over resources. Access to fertile land and water, then stored food was the locus of wars early in man's history. Slave labor became an objective of warriors. The wars between the tribes of Native Americans were about resources. Over time, control of natural resources replaced food, and control of cheap labor replaced slave labor as objectives of war. Organized religion, allied with the ruling class, was the handmaiden of the war makers. Name a major war and dig deep and you will uncover an economic base of the conflict. More death and destruction has been justified in the name of one god or another but really fought to control some resource.