The United States faces a complex and rapidly shifting international security landscape. Forces of ethnic and religious extremism, diffusion of information technologies, proliferation of mass destruction weapons, and newly empowered non-state actors are just some of the trends whose complex interplay will produce unanticipated threats. Yet, while the future is more uncertain today than during the Cold War, we currently have a window of opportunity for shaping a more favorable future. The challenge for the United States, and for all states, is not just to manage uncertainty but also to prevail in spite of it. To help address that challenge, this book examines strategic choices in uncertain times and analyzes how different strategies position states to compete, manage risk, and prevail despite uncertainty. It investigates how past and current political and military leaders have responded to uncertain strategic and technological environments, and assesses the consequences of those strategies for their state's power and influence.