"Hobbes interpreted the relationship between law and security in functionalist terms: the state accords the citizens, as the subjects of law, the guarantee of protection in exchange for their unconditional obedience. For Kant, by contrast, the pacifying function of law remains conceptually intertwined with the function of a legal condition that the citizens recognize as legitimate in promoting freedom. For the validity of law is based not only on the external threat of sanction by the state, but also on the internal reasons for the claim that it merits recognition by its addressees. Kant no longer operates with Hobbe's empiricist concept of law. However, with the idea of a transition from state-centered international law to cosmopolitan law, Kant also sets himself apart from Rousseau.
Kant breaks with the republican conception that popular sovereignty finds expression in the external sovereignty of the state — in other words, that the democratic self-determination of the people is internally linked to the collective self-assertion of a corresponding form of life, if necessary by military means. Kant recognizes that the democratic will has its roots in the ethos of a people. But that does not necessarily imply that the capacity of a democratic constitution to bind and rationalize political power must be restricted to a specific nation-state. For the universalistic thrust of the constitutional principles of a nation-state points beyond the limits of national traditions which are no doubt also reflected in the local features of a particular constitutional order.
These two operations — first, the linking of the idea of peace with a condition of legally guaranteed freedoms and, second, the separation between democratic self-determination in the domestic sphere and aggressive self-assertion toward other nations — clear the way for Kant to project the 'bürgeliche Verfassung' (i.e. the type of constitution which had recently emerged from the American and French revolutions) from the national onto the global level. This marks the birth of the idea of a constitutionalization of international law as a law of individuals. For individuals would no longer enjoy the status of legal subjects merely as citizens of a nation-state, but also as members of a politically constituted world society.
However, Kant could construe the constitutionalization of international law exclusively as a transformation of international into intrastate relations. To the very end, he advocated the idea of a world republic, even though he proposed the 'surrogate' of a league of nations [Völkerbundas] the first stage toward realizing such a commonwealth of nations [Völkerstaat]. This weak conception of a voluntary association of states that are willing to coexist peacefully while nevertheless retaining their sovereignty seemed to recommend itself as a transitional stage en route to a world republic. Many have wondered why he placed his hopes in such a conceptually flawed structure. From the vantage point of the legal and political networks of a pluralist, highly interdependent, yet functionally differentiated global society, it is easy to identify with the fortuitous hindsight of later generations the conceptual barriers that prevented Kant from overcoming this sterile alternative. Three reasons may have prevented him from conceiving the telos of the constitutionalization of international law; the 'cosmopolitan condition,' in sufficiently abstract terms to avoid assimilating it to the problematic model of a world republic and to prevent it from being dismissed as utopian" (Habermas 2009:313-315).
Habermas, Jürgen
2009[2005] Between Naturalism and Religion. Ciaran Cronin, trans. Cambridge, Polity Press.
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