Errol Henderson critically examines what has been called the closest thing to an empirical law in world politics, the concept of the democratic peace. Henderson tests two versions of the democratic peace proposition (DPP)—that democracies rarely if ever fight one another, and that democracies are more peaceful in general than nondemocracies—using exactly the same data and statistical techniques as their proponents. In effect hoisting the thesis on its own petard, he finds that the ostensible "democratic peace" has in fact been the result of a confluence of several processes during the post–World War II era. It seems clear, Henderson maintains, that the presence of democracy is hardly a guarantor of peace—and under certain conditions, it may even increase the probability of war.