A decade after the end of the Cold War, both policy makers and academics foresee a new era of peace and prosperity, an era when democracy, open trade, and mutual trust will join hands to banish war from the globe. With insight worthy of The Prince, John Mearsheimer exposes the truth behind this idyllic illusion: in a world where no international authority reigns above states, great powers invariably seek to gain power at each other's expense and to establish themselves as the dominant state.