Tensions of American Federal Democracy uses an original analytical framework combined with comparative perspectives - including those of other modern federal democracies - to explore the jigsaw puzzle that is the state of American federal democracy. The USA has a complex political system prone to "divided government", which has become highly polarized in recent years. The reasons for this extend further and deeper than party diversification or rising populism. This book provides an original contribution encompassing the US polity and its overall development. The author explores how the US constitution has predisposed branches and levels of government to multiple forms of separation of power and constituency; and how developments in democratic and federal government over time have fostered more competition, diffusion, and decoupling, despite earlier trends to more cross-branch and cross-level cooperation. The book thus addresses a multifaceted inquiry, interrogating and conceptualizing the connections between institutions, ideas, and political development, while exploring the interlinkage between the institutional parameters of multidimensional division of powers, constitutional political ideas and their contestation, and the limitation of the state in the US federal democratic system. This book will appeal to students and scholars of political science, American government and constitutional politics, federalism, comparative politics, and political theory.