<P><B>In the tradition of <I>Why Nations Fail</I>, this book solves one of the great puzzles of history: Why did the West become the most powerful civilization in the world?</B><BR/><BR/>Western exceptionalism—the idea that European civilizations are freer, wealthier, and less violent—is a widespread and powerful political idea. It has been a source of peace and prosperity in some societies, and of ethnic cleansing and havoc in others.<BR/><BR/>Yet in <I>The Invention of Power</I>, Bruce Bueno de Mesquita draws on his expertise in political maneuvering, deal-making, and game theory to present a revolutionary new theory of Western exceptionalism: that a single, rarely discussed event in the twelfth century changed the course of European and world history. By creating a compromise between churches and nation-states that, in effect, traded money for power and power for money, the 1122 Concordat of Worms incentivized economic growth, facilitated secularization, and improved