To solve these problems one needs as much an understanding of politics as an understanding of man - and the one cannot be derived from the other. - Kenneth Waltz

With many sovereign states, with no system of law enforceable among them, with each state judging its grievances and ambitions according to the dictates of its own reason or desire - conflict, sometimes leading to war, is bound to occur.

Each state pursues its own interest's, however defined, in ways it judges best. Force is a means of achieving the external ends of states because there exists no consistent, reliable process of reconciling the conflicts of interest that inevitably arise among similar units in a condition of anarchy.

The transitory interests of royal houses may be advanced in war; the real interests of all people are furthered by the peace.