Causation in International Relations

Causal claims are bound into the fabric of international relations (IR). Efforts to explain past outcomes, to predict future developments, to comprehend the range of options open to international actors, to advance policy prescriptions, and to evaluate policy decisions vis-à-vis possible alternatives all typically rely, explicitly or implicitly, on causal claims. Moreover, politicians, policymakers, and other state and nonstate actors who seek to manipulate particular aspects of world politics are also (whether they realize it or not) typically acting on causal claims. Acquiring reliable causal knowledge is therefore extremely valuable. It is, however, a challenging task. The content of causal claims is shaped not only by relevant facts about the world, but also by ideas about causation itself—for example, about what ‘causing’ is, about the kinds of things that can be causes (and effects), about how causes can be identified, and about what constitutes an adequate Causal Explanation. These are tricky and controversial issues which are often submerged below the surface of our thinking. The challenge of arriving at a clear understanding is reflected in the divisions within work which explicitly engages with questions about causation in IR, divisions which are also found within the philosophical literature on which this work draws. It is also reflected in the tendency, within the broader discipline, to set questions about causation to one side, either because they are viewed as too hard to answer or because it is not obvious how answering them will improve our knowledge of world politics. In order to gain a full picture of debates about causation in IR and their implications for substantive topics it is helpful to explore three broad kinds of literature: first, the philosophical texts which provide the backdrop against which discussions of causation in IR take place; second, existing debates about causation in IR, encompassing both mainstream discussions of methods for causal inference and more specialist literatures on causal realism, the nature of causal explanation, and the relationship between historical and causal inquiry; and third, literature in IR which explicitly examines how positions on underlying questions about causation can and do shape positions on substantive topics in IR.