The transitory interests of royal houses may be advanced in war; the real interests of all people are furthered by the peace. Man, the State, and War (1959)
War may achieve a redistribution of resources, but labor, not war, creates wealth. Man, the State, and War (1959)
Then what explains war among states? Rousseau's answer is really that war occurs because there is nothing to prevent it. Man, the State, and War (1959)