This article contributes to the European constitutional debate with a comparison of the constitutional evolution of the European Union and the United States. The European Union has more to learn from the American experience of constitutionalism than from any of its own Member States. Like the United States, the European Union will have a frame of government constitution that will try to order a system of multiple and concurrent communities of interests, as happened in America, and designed by an indirectly elected assembly. The European Union and the United States will continue to manifest many differences in other crucial aspects of their institutional and cultural development. However, although constrained by their respective historical ...