In this book a stellar collection of distinguished scholars and policy analysts explore how China's rise has brought great opportunities for cooperation as well as great challenges for geo-political competition between the United States and China not only on many difficult bilateral issues but also on increasingly complicated global and regional issues. Focusing the US-China relationship in a regional context of Northeast Asia, this book seeks the answers to many controversial questions, including: to what extent are the US and China locked in a zero-sum competition or evolved into a stable and cooperative relationship? Has the rise of China produced a power realignment among regional powers in Asia? How have the major Asian regional players responded to the evolving US-China relations and how have they adjusted their policy? Answering these important questions may provide the key for understanding great power relationships in the twenty-first century.