Book excerpt: In the early republic, constitutional debates over federal-state relations were fundamental to party battles and divergent conceptions of republicanism. Then, as now, theories about the sources and nature of federal power informed public debate, policy, and judicial decisions. In examining the conflicts of the revolutionary era, Lenner's work provides a ground-breaking overview of the 'culture of constitutionalism'--the clash of ideas about the nature and structure of Union--that pervaded the early republic.