A New Introduction to American Constitutionalism is the first text to study the entirety of American constitutionalism, not just the traces that appear in Supreme Court decisions. Mark A. Graber both explores and offers original answers to such central questions as: What is a Constitution,? What are fundamental constitutional purposes? How are constitutions interpreted? How is constitutional authority allocated? How to constitutions change? How is the Constitution of the United States influenced by international and comparative law? and, most important, How does the Constitution work? Relying on an historical/institutional perspective, the book illustrates how American constitutionalism is a distinct form of politics, rather than a means from separating politics from law.