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KANT IS OF-rEN CITED as one of the first truly international political philosophers. Unlike the vast majority of his predecessors, Kant views a purely domestic or national conception of justice as radically incomplete; we must, he insists, also turn our faculties of critical judgment towards the international plane. When he does so, what results is one of the most powerful and principled conceptions of international justice ever constructed. Kant's central concept, that it is a demand of our own practical reason that we forge a cosmopolitan federation of free republics, based on the rule of law, human rights, and cultural and commercial development, still resonates today as a plausible and hopeful prescription for humanity's future.
Much of Kant's international theory has recently received searching analysis and evaluation. But the bulk of this consideration has focused on Kant's descriptive, as opposed to prescriptive, claims. Lavish attention, for example, has been showered on his assertion that perpetual peace is inevitable-that our natural antagonism will irresistibly incline us, after many failures, to establish an international juridical condition. Comparatively little has been done on thoroughly evaluating Kant's normative claims of international justice, particularly with regard to his ideal corpus of international law and his concrete recommendations for moving from a global state of nature to a cosmopolitan civil society.1
In this paper, I would like to contribute to the latter task by focusing on the moral problem that war poses as, arguably, the most frequent and severe cause of ruptures in the functioning of the international system.2 In particular, I would like to argue in favour of the controversial, and original, thesis that Kant has a just war theory.3 I would then like to develop that theory in some detail and to explain its strength and suggestiveness. The focus on war seems both helpful and timely. It is helpful in that it provides a specific, graphic example with which one can apprehend more clearly the abstract architecture of Kant's international vision. It is timely in that, in the wake of the very recent conflicts in Bosnia and Rwanda, and in light of the subsequent formation of the International War Crimes Tribunals at The Hague, renewed attention has been paid to considering what, if anything, constitutes a just war and...