Fundamental questions about constitutional interpretation and meaning invite a close examination of the complicated origins and the subsequent elaboration of the very structure of federalism. The available records of the Proceedings in the Federal Convention make clear that the Framers entertained two approaches to delineating the powers of the central government relative to those retained by the states. The competing approaches, one reliant on a formalist enumeration of permissible powers, the other operating functionally on the basis of a broad dynamic concept of state incompetence and national interest, often are presented as mutually inconsistent narratives. In fact, these two approaches can be understood, at the founding and at critica...