East Asia is becoming, in the language of international relations theory, “bipolar.” That metaphor, from magnetism, suggests two large states with overlapping spheres of influence competing for regional leadership. The Cold War was a famous global example of bipolarity. Most states in the world tilted toward the United States or the Soviet Union in a worldwide, zero-sum competition. Although analysts have hesitated for many years in applying such strong language to East Asia, this is now increasingly accepted. A lengthy twilight struggle between China and Japan, with U.S. backing, seems in the offing. Until recently, Asia was arguably “multipolar”—there was no one state large enough to dominate and many roughly equal states competed for influence. China’s dramatic rise has unbalanced that rough equity. China is now the world’s second largest GDP. Although its growth is slowing, it is still expanding at triple the rate of the U.S. economy and six times the rate of Japan’s. By 2020 China is predicted to be the world’s largest economy. Its population, 1.35 billion, is enormous. One in seven persons on the planet is Chinese. Were China’s GDP per capita to ever reach Japanese or American levels, its total GDP would match that of entire planet today. These heady numbers almost certainly inspire images of national glory or a return to the “middle kingdom,” in Beijing. They help account for China’s increasingly tough claims in the East and South China Seas. Until recently, China pursued a “peaceful rise” strategy, one of accommodation and mutual adjustment. This approach sought to forestall an anti-Chinese encircling coalition. China’s rapid growth unnerves many states on its perimeter, from India, east to Vietnam, Indonesia and Australia, north to Taiwan, Japan, and Russia. Were these states to align, they might contain China in the same way the Japan, China, and NATO all worked to contain the U.S.SR. The peaceful rise seemed to work, especially in southeast Asia, where Chinese generosity has successfully blocked a united ASEAN position on South China Sea issues.