Preemption is a doctrine of American constitutional law, under which states and local governments are deprived of their power to act in a given area, whether or not the state or local law, rule or action is in direct conflict with federal law. This book covers not only the basics of preemption but also focuses on such topics as federal mechanisms for agency preemption, implied forms of preemption, and defensive use of federal preemption in civil litigation.

This book examines the theory, law, and reality of preemption choice. The Constitution's federalist structures protect states' sovereignty but also create a powerful federal government that can preempt and thereby displace the authority of state and local governments and courts to respond to a social challenge. Despite this preemptive power, Congress and agencies have seldom preempted state power. Instead, they typically have embraced concurrent, overlapping power. Recent legislative, agency, and court actions, however, reveal an aggressive use of federal preemption, sometimes even preempting more protective state law. Preemption choice fundamentally involves issues of institutional choice and regulatory design: should federal actors displace or work in conjunction with other legal institutions? This book moves logically through each preemption choice step, ranging from underlying theory to constitutional history, to preemption doctrine, to assessment of when preemptive regimes make sense and when state regulation and common law should retain latitude for dynamism and innovation.

Challenging the myth that the federal government exercises exclusive control over U.S. foreign-policymaking, Michael J. Glennon and Robert D. Sloane propose that we recognize the prominent role that states and cities now play in that realm. Foreign Affairs Federalism provides the first comprehensive study of the constitutional law and practice of federalism in the conduct of U.S. foreign relations. It could hardly be timelier. States and cities recently have limited greenhouse gas emissions, declared nuclear free zones and sanctuaries for undocumented immigrants, established thousands of sister-city relationships, set up informal diplomatic offices abroad, and sanctioned oppressive foreign governments. Exploring the implications of these and other initiatives, this book argues that the national interest cannot be advanced internationally by Washington alone. Glennon and Sloane examine in detail the considerable foreign affairs powers retained by the states under the Constitution and question the need for Congress or the president to step in to provide "one voice" in foreign affairs. They present concrete, realistic ways that the courts can update antiquated federalism precepts and untangle interwoven strands of international law, federal law, and state law. The result is a lucid, incisive, and up-to-date analysis of the rules that empower-and limit-states and cities abroad.