In an increasingly crowded field, this new book on comparative federalism stands out for its iconoclasm, for its illuminating and entertaining selection of illustrative examples, but most of all for a significant methodological breakthrough that makes the book both more useful and more coherent than most of its predecessors ... Because they are not bound to the simplifications of a model, [the authors] are free to concede the enormous complexity of forces that shape federal states ... As a result, their accounts of conditions in individual states are unusually thorough, accurate, and persuasive.