The other modern plans for a perpetual peace descend from Kant's 1795 essay, "". In this essay, Kant described his proposed peace program. Perpetual peace is arguably seen as the starting point of contemporary liberal thought. "Perpetual Peace" is structured in two parts. The Preliminary Articles described the steps that should be taken immediately, or with all deliberate speed:
"No independent states, large or small, shall come under the dominion of another state by inheritance, exchange, purchase, or donation"
"Standing armies shall in time be totally abolished"
"National debts shall not be contracted with a view to the external friction of states"
"No state shall by force interfere with the constitution or government of another state"
"No state shall, during war, permit such acts of hostility which would make mutual confidence in the subsequent peace impossible: such are the employment of assassins, poisoners, breach of capitulation, and incitement to treason in the opposing state"
Three Definitive Articles would provide not merely a cessation of hostilities, but a foundation on which to build a peace:
"The civil constitution of every state should be republican"
"The law of nations shall be founded on a federation of free states"
"The law of world citizenship shall be limited to conditions of universal hospitality"
Kant's essay in some ways resembles modern democratic peace theory, though it also differs significantly from it. He speaks of republican states, which he defines to have representative governments, in which the legislature is separated from the executive. He does not discuss universal suffrage, which is vital to modern democracy and quite important to some modern theorists; his commentators dispute whether it is implied by his language. Most importantly, he does not regard republican governments as sufficient by themselves to produce peace: freedom of travel, though not necessarily migration, ; and a league of nations are necessary to consciously enact his six-point program. Unlike some modern theorists, Kant claims not that republics will be at peace only with each other, but are more pacific than other forms of government in general. The general idea that popular and responsible governments would be more inclined to promote peace and commerce became one current in the stream of European thought and political practice. It was one element of the American policy of George Canning and the foreign policy of Lord Palmerston. It was also represented in the liberal internationalism of Woodrow Wilson, George Creel, and H.G. Wells, although other planks in Kant's platform had even more influence. In the next generation, Kant's program was represented by the Four Freedoms and the United Nations. Kant's essay is a three-legged stool. Various projects for perpetual peace have relied on one leg – either claiming that it is sufficient to produce peace, or that it will create the other two. In 1909, Norman Angell relied only upon the second leg, arguing that modern commerce made war necessarily unprofitable, even for the technically victorious country, and therefore the possibility of successful war was The Great Illusion. James Mill had described the British Empire as outdoor relief for the upper classes; Joseph Schumpeter argued that capitalism made modern states inherently peaceful and opposed to conquest and imperialism, which economically favored the old aristocratic elites. This theory has been well developed in recent years. Mansfield and Pollins, writing in the Journal of Conflict Resolution, summarize a large body of empirical work which, for the most part, supports the thesis. There are various exceptions and qualifications which seem to limit the circumstances under which economic interdependence results in conflict reduction. On the other hand, moving beyond economic interdependence to the issue of economic freedom within states, Erik Gartzke has found empirical evidence that economic freedom is about fifty times more effective than democracy in reducing violent conflict. The third leg is the old idea that a confederation of peaceable princes could produce a perpetual peace. Kant had distinguished his league from a universal state; Clarence Streit proposed, in Union Now, a union of the democratic states modelled after the Constitution of the United States. He argued that trade and the peaceable ways of democracy would keep this Union perpetual, and counted on the combined power of the Union to deter the Axis from war. In "A Plan for an Universal and Perpetual Peace", part IV of Principles of International Law, Jeremy Bentham proposed that disarmament, arbitration, and the renunciation of colonies would produce perpetual peace, thus relying merely on Kant's preliminary articles and on none of the three main points; contrary to the modern theorists, he relied on public opinion, even against the absolute monarchy in Sweden. Since 2008, the Perpetual Peace Project—a partnership between the European Union National Institutes for Culture, the International Peace Institute, the United Nations University, Slought Foundation, and Syracuse University—is engaging Kant's essay in an ongoing philosophical and curatorial initiative that is conceptualized around ultimately "re-writing" Kant's 1795 treatise, as well as a republication of the essay.
