This new book offers a coherent model of a unipolar world order. Unipolarity is usually described either as a ‘brief moment’ or as something historically insignificant. However, we have already seen nearly twenty years of virtual unipolarity and this period has been of great significance for world politics. Two issues have been crucial since the end of the Cold War: How to theorize the distinctiveness and exceptional character of a unipolar international system? And what is it like to conduct state business in a unipolar world? Until now, a comprehensive model for unipolarity has been lacking. This volume provides a theoretical framework for analysis of the current world order and identifies the patterns of outcomes and systematic variations to be expected. Terrorism and attempts by small states to achieve a nuclear capability are not new phenomena or exclusive to the current world order, but in the case of unipolarity these have become attached to the fear of marginalization and the struggle against a powerful centre without the possibility of allying with an alternative superpower. Supplying a coherent theoretical model for unipolarity, which can provide explanations of trends and patterns in the turbulent post-Cold War era, this book will be of interest to students of IR theory, international security and foreign policy.

Since the collapse of the Soviet Union, the international system has been unipolar, centered on the United States. But the rise of China foreshadows a change in the distribution of power. Øystein Tunsjø shows that the international system is moving toward a U.S.-China standoff, bringing us back to bipolarity—a system in which no third power can challenge the top two. The Return of Bipolarity in World Politics surveys the new era of superpowers to argue that the combined effects of the narrowing power gap between China and the United States and the widening power gap between China and any third-ranking power portend a new bipolar system that will differ in crucial ways from that of the last century. Tunsjø expands Kenneth N. Waltz’s structural-realist theory to examine the new bipolarity within the context of geopolitics, which he calls “geostructural realism.” He considers how a new bipolar system will affect balancing and stability in U.S.-China relations, predicting that the new bipolarity will not be as prone to arms races as the previous era’s; that the risk of limited war between the two superpowers is likely to be higher in the coming bipolarity, especially since the two powers are primarily rivals at sea rather than on land; and that the superpowers are likely to be preoccupied with rivalry and conflict in East Asia instead of globally. Tunsjø presents a major challenge to how international relations understands superpowers in the twenty-first century.

Since the collapse of the Soviet Union, the United States has enjoyed unparalleled military power. The international system is therefore unipolar. A quarter of a century later, however, we still possess no theory of unipolarity. Theory of Unipolar Politics provides one. Dr Nuno P. Monteiro answers three of the most important questions about the workings of a unipolar world. Is it durable? Is it peaceful? What is the best grand strategy a unipolar power such as the contemporary United States can implement? In our nuclear world, the power preponderance of the United States is potentially durable but likely to produce frequent conflict. Furthermore, in order to maintain its power preponderance, the United States must remain militarily engaged in the world and accommodate the economic growth of its major competitors, namely, China. This strategy, however, will lead Washington to wage war frequently. In sum, military power preponderance brings significant benefits but is not an unalloyed good.

This volume analyzes the decisions that major powers have made since the Cold War to adapt to a rapidly changing economic and security environment. The authors acknowledge that, while great power wars are now unlikely, positional conflicts over resources and markets still remain.

The end of the Cold War and subsequent dissolution of the Soviet Union resulted in a new unipolar international system that presented fresh challenges to international relations theory. Since the Enlightenment, scholars have speculated that patterns of cooperation and conflict might be systematically related to the manner in which power is distributed among states. Most of what we know about this relationship, however, is based on European experiences between the seventeenth and twentieth centuries, when five or more powerful states dominated international relations, and the latter twentieth century, when two superpowers did so. Building on a highly successful special issue of the leading journal World Politics, this book seeks to determine whether what we think we know about power and patterns of state behavior applies to the current 'unipolar' setting and, if not, how core theoretical propositions about interstate interactions need to be revised.

A comprehensive theory of the causes of nuclear proliferation, alongside an in-depth analysis of sixteen historical cases of nuclear development.

This is the first book-length treatment of international politics in a unipolar world that adopts a structural realist perspective. It applies Waltz's microeconomic analogy to a market with a price leader. It concludes that unipolarity is sustainable as long as the unipole distributes rewards to other states.