Rethinking Europe's Future is a major reevaluation of Europe's prospects as it enters the twenty-first century. David Calleo has written a book worthy of the complexity and grandeur of the challenges Europe now faces. Summoning the insights of history, political economy, and philosophy, he explains why Europe was for a long time the world's greatest problem and how the Cold War's bipolar partition brought stability of a sort. Without the Cold War, Europe risks revisiting its more traditional history. With so many contingent factors--in particular Russia and Europe's Muslim neighbors--no one, C.