In this paper I ask the following question: of all the historical or the existing types of political regimes, which one would have had Kant's preference, which one would have counted for him as a model ? I guess he would have answered that it was the American polity which inspired him more than any other in history past and present. In the present contribution I'll try to demonstrate this rather bold hypothesis. I'll rely mainly on Perpetual Peace and on Meptaphysics of Morals.