During the past two decades, the world has seen an astonishing number of changes: the rise of new economic powers in Asia, the retreat of communism and the advance of capitalism and democracy, the return of religion to politics, the spread of the Internet and wireless technologies, the deepening of globalization. As a result, many of the traditional assumptions and beliefs held by scholars, policy makers, and citizens are open to question. New centres of wealth may reduce poverty, increase inequality, or both. Democracy may be an inexorable force, or it may founder on the obstacles of nationalism, economic instability, or culture. New forms of electronic communication may bind people across societies, creating shared identities, or fragment communities, generating a backlash