A quarter century after Paul Kennedy's The Rise and Fall of the Great Powers, Glenn Hubbard and Tim Kane present a bold, sweeping account of why powerful nations and civilizations break down under the heavy burden of economic imbalance. Introducing a profound new measure of economic power, Balance traces the triumphs and mistakes of imperial Britain, the paradox of superstate California, the long collapse of Rome, and the limits of the Japanese model of growth. Most importantly, Hubbard and Kane compare the twenty-first-century United States to the empires of old and challenge Americans to address the real problems of our country's dysfunctional fiscal imbalance. If there is not a new economics and politics of balance, they show that there will be an inevitable demise ahead.