The Cold War was the most important feature of the international system in the second half of the twentieth century. The rivalry between the Soviet Union and the United States shaped the contours of conflict and cooperation among states and peoples between 1945 and 1991 and its dynamics permeated almost all corners of the globe. Whether in Baghdad, Bangkok or Brussels, the influence of geopolitical and ideological conflict was unmistakable. The Cold War created rivalries and political faultlines that have continued to shape international relations years after its passing. Sino-American competition has become so intense that many think the world is on the brink of another period of bipolar rivalry.

This chapter offers an account of postmodernism. It begins by drawing a distinction between two broad approaches to the postmodern: one that outlines the contours of a new historical period (postmodernity), and another that places emphasis on finding new ways of understanding modern practices of knowledge and politics (postmodernism). The second part of the chapter examines how postmodern ideas entered international relations scholarship, and how ensuing contributions continue to reveal important insights up to the present day. Defining postmodernism is no easy task. Postmodern scholarship is characterised more by diversity than by a common set of beliefs. Add to this that the postmodern has become a very contentious label, which is used less by its advocates and more by polemical critics who fear that embracing postmodern values would throw us into a dangerous nihilist void. But while the contours of the postmodern will always remain elusive and contested, the substantial issues that the respective debates have brought to the fore are important enough to warrant attention.

The first section of this chapter looks at how the two terms ‘migrant’ and ‘refugee’ came to be defined as distinct from each other in the context of the modern state. The second examines how states define and categorise refugees through laws that seek to contain and limit their flow. The third section is concerned with the consequences of limiting the definition of a refugee, which has led to an unequal burden between developed and developing states. The final section will canvass the various options presented to reduce the present imbalance where the vast majority of the world’s refugees eke out an existence in refugee camps in developing countries. Ultimately, this chapter seeks to demonstrate that the choices made by states in border protection become the key determinants of how refugees will be accepted. Adherence to international refugee law will not necessarily address all the problems associated with refugees, but nor will seeing refugees as unwanted intruders in contrast to ‘desirable’ migrants.

This chapter gives an overview of the long history, nature and significance of terrorism for international relations. It first addresses the topic’s recent prominence. Terrorism is by no means the most brutal type of violence, especially compared to wars in which states have killed millions of people. But it garners outsized attention through its symbolic nature. Only by educating ourselves can we rob terrorism of the source of its power. Second, it addresses key academic debates, which usually go back to the definition. The chapter argues that there are core areas of international agreement about what a terrorist act is, and that it can and should be distinguished from other types of violence. It also explains the lively debate over digital technology and the future of terrorism. Third, it lays out intellectual frameworks that help us to understand and analyse terrorism, including types of terrorism, historical patterns and the strategies used by terrorist groups. The chapter concludes with reflections about what is at stake in countering this type of illegitimate act.

This chapter suggests paths along which the futures of international relations as subject matter and International Relations as an academic discipline may develop. First, it stresses that the division between the ‘traditional’ and ‘new’ or ‘non-traditional’ agenda is intended as a device to facilitate learning for new students of international relations. Second, it outlines how novel intellectual developments in the field are shaping its future trajectory, with a specific focus on the continued development of a ‘Global IR’; IR’s increasing intellectual engagement with the sociology of Science and Technology Studies (STS) and STEM subjects as sources of conceptual innovation; and recent attempts to define the International as a condition of interactive multiplicity in an effort to clarify its distinctive contribution to the wider social sciences. Finally, the chapter notes that thinking about the future itself is becoming increasingly central to the discipline, with methods of counterfactual analysis, social imaginaries of future histories and utopian idealisations emerging as important theoretical and political projects.

The discipline of International Relations owes its origins to the study of war and peace. But are today’s wars so different from their predecessors that we need a new mindset? To answer that question, this chapter begins with warfare’s diverse ends and means before considering five leading issues: the role of violence in warfare; the extent to which that violence is organised; the political nature of war; the interactive nature of warfare; and the scope and scale of war. The argument presented here is that war’s essential features have not changed as much as we might think. This should make us sceptical about claims that the role of war in international relations has somehow been revolutionised.

This chapter presents a fleeting history of key changes in global trade and finance in the post-war period, organised around the themes of crisis and cooperation. The first section of the chapter discusses the key themes. The second section considers the emergence of the post-World War II Bretton Woods regime. The third section outlines the rise of private capital in the 1970s through to the debt crisis of the 1980s. The fourth section considers discussions of global financial architecture in the 1990s to the 2000s. The fifth section discusses changes in the last fifteen years, focusing on how the trade regime has stalled and the financial regime has been partially rolled back. Finally, the concluding section reflects on the ever-present need to foster cooperation in the global financial and trade architecture.

This chapter introduces students to the rich and controversial legacy of Marxism and one of its major offshoots in the twentieth century, Critical Theory. The chapter is presented in two parts. The first part touches on the historical and intellectual context that ‘created’ Marxism, Marx’s notion of historical materialism and the issue of how Marx’s ideas have been received in IR. The second part concentrates on the two strands of Critical Theory that have emerged within IR: one derived from the so-called Frankfurt School and the other from Italian thinker Antonio Gramsci.

This chapter examines several feminist approaches to the study and practice of international relations. It highlights the similarities between these approaches, but also the differences. It does this first by tracing the interventions made by feminists into international relations and the creation of a distinctly feminist IR agenda. Second, it uses the ‘gender lens’ to demonstrate and analyse how experiences and understandings in international relations can be ‘gendered’. Finally, it explains and examines the critiques made by the different feminist approaches to international relations.

Liberalism is at the heart of modern ‘Western’ history, politics, and international relations. Central to understandings of liberty, freedom, democracy, rights and the rule of law, liberalism has animated debates on abolition and empire, war and peace. This chapter provides an account of liberalism as a contested phenomena that originated at least in the eighteenth century and has had profound international political consequences ever since. To tell this story, the chapter begins by considering how to make sense of the contestations surrounding liberalism, before examining how and why liberalism matters to International Relations at key moments of its development as a discipline: in the age of empires, the inter-war years, during the Cold War and ‘new’ world which ensued, and now in this epoch of endless war.

International law governs almost every facet of international life, from the mundane to the complex. This chapter discusses the role of international law in world politics. It begins with a discussion of the content of international law, explaining the sources of law and how we identify them. It then addresses the question of why the study of international law is foundational to the study of international relations. The chapter offers two answers to this question. First, international law is important in the study of international relations because the nature and extent of its influence are among the core debates in international relations theory. Second, the study of international law is important because law is at the heart of many international disputes today. The chapter concludes by considering two examples of ‘law in action’: the legal decision regarding Chinese activities in the South China Sea and the contemporary debate over membership of the International Criminal Court.