If it is good for states, it is certainly good for cities.

If it is good for peoples, it is good for individuals.
War is Hell, and from Hell.

Hell may not be abolished, but it may be regulated.
Wars may not be abolished from the human heart, but they may be restrained from breaking forth to the destruction of the innocent and the guiltless.
There is only one practical way to do this, and that is to have nations under restraint, just as nations have states and cities under restraint.

Then international courts of justice may perform the same work national courts now perform in respect to differences between states.
Man has come up from the individual, or dual, unit through family and tribal relation, the walled city, the policed state, into the armed nation.

He is now steadily stepping forth into the world as ruler of himself, the creator of his own government, the heir and sovereign of the world.