Despite the widespread assumption of terrorism's “terrifying” effect, there has been little systematic testing of the specific emotional microfoundations underlying public opinion about terrorism. While fear is one well-recognized emotional response to terror threats, in societies where terrorism is rare, anger may play a more pivotal role, with distinct consequences for citizens’ downstream political

Colonial warfare has been a frequent and bloody feature of international relations, yet most studies of wartime civilian victimization focus on either interstate or civil wars. In this article I argue that ignoring colonial violence has distorted our understanding of state-directed violence against civilians in wartime. I introduce a new theory of colonial violence, which focuses on the distinctive

Once the object of consensus, every aspect of the traditional account of early modern Europe as an anarchic system of sovereign states is now debated—from the existence of sovereign states to the notion of anarchy, and even the European limits of that system. In the context of these disagreements, I develop a new account of international order in early modern Europe grounded in the perceptions of historical

Most autocracies restrict emigration yet still allow some citizens to exit. How do these regimes decide who can leave? We argue that many autocracies strategically target anti-regime actors for emigration, thereby crafting a more loyal population without the drawbacks of persistent co-optation or repression. However, this generates problematic incentives for citizens to join opposition activity to

Almost all technology is dual use to some degree: it has both civilian and military applications. This feature creates a dilemma for cooperation. States can design arms control institutions to curtail costly competition over some military technology. But they also do not want to limit valuable civilian uses. How does the dual use nature of technology shape the prospects for cooperation? We argue that

How do emerging technologies affect nuclear stability? In this paper, we use a quasi-experimental cyber-nuclear wargame with 580 players to explore three hypotheses about emerging technologies and nuclear stability: (1) technological uncertainty leads to preemption and escalation; (2) technological uncertainty leads to restraint; and (3) technological certainty leads to escalation through aggressive

Since the 1990s, the funding of multilateral development assistance has rapidly transformed. Donors increasingly constrain the discretion of international development organizations (IDOs) through earmarked funding, which limits the purposes for which a donor's funds can be used. The consequences of this development for IDOs’ operational performance are insufficiently understood. We hypothesize that

Prominent theories of state formation hold that states formed because of warfare and competition on the one hand, or the diffusion of organizational templates and practices through learning and emulation on the other. We propose that the two strands of theory can be linked to more accurately account for mechanisms of state formation. War, we argue, is an important source of social diffusion. War establishes

In this article I explain a nexus between slavery and state formation in Africa, proceeding from initial demographic and institutional conditions to an external demand shift, individual state responses, and their collective systemic consequences. Historically, African rulers faced distinctive challenges: low population density prioritized control of people more than territory, and internal disintegration

Any act of battlefield violence results from a combination of organizational strategy and a combatant's personal motives. To measure the relative contribution of each, our research design leverages the predictable effect of ambient temperature on human aggression. Using fine-grained data collected by US forces during the Afghanistan and Iraq conflicts, we test whether temperature and violence are linked

What effect does state violence have on the cohesiveness and fragmentation of insurgent organizations? This article develops a theory of how state violence against civilians affects insurgent cohesion and fragmentation in civil war. It argues that the state-led collective targeting of an armed group's alleged civilian constituency increases the probability of insurgent fragmentation, defined as the

A distinguishing feature of the modern state is the broad scope of social welfare provision. This remarkable expansion of public assistance was characterized by huge spatial and temporal disparities. What explains the uneven expansion in the reach of social welfare? We argue that social welfare expansion depends in part on the ability of the governed to compel the state to provide rewards in return

Charles Tilly's classical claim that “war made states” in early modern Europe remains controversial. The “bellicist” paradigm has attracted theoretical criticism both within and beyond its original domain of applicability. While several recent studies have analyzed the internal aspects of Tilly's theory, there have been very few systematic attempts to assess its logic with regard to the territorial

How do states distribute the burdens of collective defense? This paper develops a network theory of burden sharing. We focus on bilateral defense cooperation agreements (DCAs), which promote cooperation in a variety of defense, military, and security issue areas. Using a computational model, we show that DCA partners’ defense spending depends on the network structure of their agreements. In bilateral

Why do states create weak international institutions? Frustrated with proliferating but disappointing international environmental institutions, scholars increasingly bemoan agreements which, rather than solving problems, appear to exist “for show.” This article offers an explanation of this phenomenon. I theorize a dynamic of deflective cooperation to explain the creation of compromise face-saving

The development of parliamentary constraints on the executive was critical in Western European political history. Previous scholarship identifies external wars as a key factor, but with varying effects. Sometimes, willing monarchs granted parliamentary rights in return for revenues to fight wars. Yet at other times, war threats empowered rulers over other elites or caused states to fragment. We analyze

We examine whether politically irrelevant events can cause conflicts, by analyzing the effects of professional football games in Europe on protests in Africa—an unintended spillover across the continents. By expanding psychological theories, we argue that the outcomes of the football games in Europe can affect African people's subjective evaluation of domestic politicians, which in turn can trigger

How do international organizations change the discussion of human rights violations, and how does their message reach the broader public? I show that national media is a key conduit. I analyze media coverage from the Philippines to show that the content of media coverage of the “war on drugs” changed after a major decision by the International Criminal Court. The ICC increased the proportion of media

This article presents a formal model that shows how states can credibly reassure each other simply by maintaining a cooperative outward narrative. The reassurance literature to date has focused largely on costly signaling, whereby benign states must distinguish themselves by taking specific actions that hostile types would not. The mere lack of overtly expressed hostility without costly signals has

International organizations come in many shapes and sizes. Within this institutional gamut, the multipurpose multilateral intergovernmental organization (MMIGO) plays a central role. This institutional form is often traced to the creation of the League of Nations, but in fact the first MMIGO emerged in the Western Hemisphere at the close of the nineteenth century. Originally modeled on a single-issue

International relations theory has had a trust revival, with scholars focusing on how trust can enhance interpersonal cooperation attempts between leaders. We propose there is another type of trust at play in world politics. International system trust is a feeling of confidence in the international social order, which is indexed especially by trust in its central unit, state persons. System trust anchors

How does collective memory shape politics in the domestic and international spheres? I argue that collective memory—an intersubjective understanding of the past—has no inherent meaning and its salience is entirely contextual. What it means politically depends on the historical trajectory through which it came to form and the political exigency for which it is mobilized in the present. I propose three

This article describes and explains a previously overlooked empirical pattern in state revenue collection. As late as 1913, central governments in the West collected similar levels of per capita revenue as the rest of the world, despite ruling richer societies and experiencing a long history of fiscal innovation. Western revenue levels permanently diverged only in the following half-century. We identify

A popular view holds that foreign policy hawks have an advantage at bringing about rapprochement with international adversaries. This idea is rooted in domestic politics: voters respond more favorably to efforts at reconciliation when their own leader has a hawkish rather than a dovish reputation. Yet, domestic reactions are only part of the equation—to succeed, rapprochement must also evoke a favorable

Do citizens care whether their government breaches international law, or are other imperatives more influential? We consider this question in the human rights arena, asking whether and how it matters how abuses are framed. In a novel survey experiment, we ask Australians about their attitudes toward restrictive immigration policy, holding the underlying breaches constant but varying how they are framed

This article examines the emergence of early international organizations and efforts to export European institutional models to the periphery as part of the global expansion of a European international order. In particular, it focuses on the 1884–85 Berlin Conference as a pivotal moment in that expansion and the failed attempt to transplant the Treaty of Vienna model for transboundary river governance

This article analyzes the efficacy of border enforcement against smuggling. We argue that walls, fences, patrols, and other efforts to secure porous borders can reduce smuggling, but only in the absence of collusion between smugglers and state agents at official border crossings. When such corruption occurs, border enforcement merely diverts smuggling flows without reducing their overall volume. We

What determines public support for trade liberalization? Scholars of international political economy have generally focused on the effects of openness on employment via individuals’ skill level, sector, or occupation. Recent developments in trade economics suggest that the characteristics of individual citizens’ employing firms may also shape their attitudes on trade policy. In this paper, using under-explored

The Syrian Civil War that began in 2011 killed more than 400,000 civilians. Could a limited intervention motivated by humanitarian concerns have reduced the death toll at an acceptable cost to the intervenors? I distinguish between two approaches to intervention: penalizing atrocities, by raising the cost and lowering the benefit of killing civilians; and fostering a balance of power, to convince the

How do cognitive biases relevant to foreign policy decision making aggregate in groups? Many tendencies identified in the behavioral decision-making literature—such as reactive devaluation, the intentionality bias, and risk seeking in the domain of losses—have been linked to hawkishness in foreign policy choices, potentially increasing the risk of conflict, but how these “hawkish biases” operate in

The English East India Company's “company-state” lasted 274 years—longer than most states. This research note uses new archival evidence to study the Company as a catalyst in the development of modern state sovereignty. Drawing on the records of 16,740 managerial and shareholder meetings between 1678 and 1795, I find that as the Company grew through wars, its claim to sovereign authority shifted from

When do people care about relative gains in trade? Much of the international relations scholarship—and much of the political rhetoric on trade—would lead us to expect support for a trade policy that benefits ourselves more than it benefits others. Yet, a large interdisciplinary literature also points to the prevalence and importance of other-regarding preferences, rendering the conventional wisdom

Nongovernmental organizations are central to contemporary global governance, and their numbers and influence have grown dramatically since the middle of the twentieth century. However, in the last three decades more than 130 states have repressed these groups, suggesting that a broad range of states perceive them as costly. When they choose to repress NGOs, under what conditions do states use violent

Why has gold persisted as a significant reserve asset despite momentous changes in international monetary relations since the collapse of the classical gold standard? IPE theories have little to say about this question. Conventional accounts of international monetary relations depict a succession of discrete monetary regimes characterized by specific power structures or dominant ideas. To explain the

Scholarship on human rights diplomacy (HRD)—efforts by government officials to engage publicly and privately with their foreign counterparts—often focuses on actions taken to “name and shame” target countries because private diplomatic activities are unobservable. To understand how HRD works in practice, we explore a campaign coordinated by the US government to free twenty female political prisoners

A central theme in the study of international relations is that anarchy requires states to set aside moral concerns to attain security, rendering IR an autonomous sphere devoid of ethical considerations. Evolutionary and moral psychology, however, suggest that morality emerged to promote human success under such conditions. It is not despite anarchy but because of anarchy that humans have an ethical

How do voters want their governments to respond when another country unilaterally withdraws from an international institution? We distinguish between negotiation approaches that vary in the degree to which they accommodate the withdrawing state's demands and argue that negotiation preferences are shaped by two issues. The first is voters’ exposure to the costs and benefits of accommodation. This exposure

We analyze the design of an international climate agreement. In particular, we consider two goals of such an agreement: overcoming free-rider problems and adjusting for differences in mitigation costs between countries. Previous work suggests that it is difficult to achieve both of these goals at once under asymmetric information because countries free ride by exaggerating their abatement costs. We

How does naming and shaming affect public support for compliance with international agreements? We investigated this question by conducting survey experiments about the Paris Agreement, which relies on social pressure for enforcement. Our experiments, administered to national samples in the United States, produced three sets of findings. First, shaming by foreign countries shifted domestic public opinion

Foundational theories of trade politics emphasize a conflict between consumer welfare and protectionist lobbies. But these theories ignore other powerful lobbies that also shape trade policy. We propose a theory of trade distortion arising from conflict between consumer welfare and importer lobbies. We estimate the key parameter of the model—the government's weight on welfare—using original data from

Recent world events, such as the rise of hypermasculine authoritarian leaders, have shown the importance of both sex and gender for understanding international politics. However, quantitative researchers of conflict have long relegated the study of sex and gender inequality as a cause of war to a specialized group of scholars, despite overwhelming evidence that the connections are profound and consequential

How effective are states at assessing and predicting the nuclear intentions of foreign countries? Drawing on close to 200 US assessments of foreign countries’ proliferation intentions between 1957 and 1966, this research note finds that close to 80 percent of testable US assessments were correct and that they shifted from highly inaccurate in the late 1950s to highly accurate in the 1960s. Based on

What motivates politicians and political parties to shift their positioning on an issue? Focusing on the case of trade policy in countries with advanced economies and plurality electoral systems, I argue that the relative positioning of parties on an existing issue can change even when the preferences of the key actors (voters and politicians) are held constant, and even when party leaders continue

For many centuries, conquest was commonplace, and its attractiveness was central to the character of international politics. Why has it declined? Existing theories cannot explain why powerful countries no longer conquer states with easily extractable wealth. We develop an explanation based on the relationship between a potential conqueror's economic productivity and its ability to profit from conquest

Can third parties build nations after ethno-sectarian war? We provide a positive theory of peace building that highlights trade-offs that are inherent in any foreign intervention, narrowing the conditions for success even when interventions are well resourced and even-handed. A “sectarian” dilemma arises because peace must rely on local leaders, but leaders who earned their reputations through ethno-sectarian

How do extremist sympathizers respond to counter-radicalization efforts? Over the past decade, programs to counter violent extremism have mushroomed around the world, but little is known of their effectiveness. This study uses social media data to examine how counter-radicalization efforts shape engagement with extremist groups in the online world. Matching geolocated Twitter data on Islamic State

While the firm-level distributional consequences of market liberalization are well understood, previous studies have paid only limited attention to how variations in domestic institutions across countries affect the winners and losers from opening up to trade. We argue that the presence of coordinated wage-bargaining institutions, which impose a ceiling on wage increases, and state-subsidized vocational

Although rebel groups are players on the international stage, little is known about their financial strategies at this scale. Existing research suggests that rebels succeed in cross-border trade by using informal networks that evade state authority. Yet rebels face a critical challenge: they operate in a normative environment that values state recognition and penalizes their illegitimate status. New

There is increasing agreement that states and other political actors on the world stage sometimes achieve international authority. However, there is less agreement about the nature and functioning of international authority relations. What determines whether an actor will be recognized as an authoritative actor? And what are the effects thereof? In this essay, we identify four distinct conceptions

We address a debate over the effects of private versus customary property rights on external investment. Despite political economists’ claims that external investors favor private property rights, other experts argue that customary systems enable large-scale “land grabs.” We organize these competing claims, highlighting trade-offs due to differences in legibility versus the ability to displace existing

International organizations (IOs) increasingly pool resources and expertise. Under what conditions do they pool rather than compete when their activities overlap? Drawing on elite interviews, I argue that even though many cooperation decisions are made by staff possessing high degrees of autonomy from member state principals, IOs are more likely to pool resources when their leading stakeholders are

Multinational firms operate in multiple national jurisdictions, making them difficult for any one government to regulate. For this reason the firms themselves are often in charge of their own regulation, increasingly in conjunction with international organizations by way of public-private governance initiatives. Prior research has claimed that such initiatives are too weak to meaningfully change firms’

How does the design of military institutions affect who bears the costs of war? We answer this question by studying the transformative shift from segregated to integrated US military units during the Korean War. Combining new micro-level data on combat fatalities with archival data on the deployment and racial composition of military battalions, we show that Black and white soldiers died at similar

Does diplomacy affect the prospects of international conflict and cooperation? Systematic empirical assessment has been hindered by the inferential challenges of separating diplomacy from the distribution of power and interests that underlies its conduct. This paper addresses the question of diplomacy's efficacy by examining the intragovernmental politics of US foreign policy, and the varying influence

Cooperation among militant organizations contributes to capability but also presents security risks. This is particularly the case when organizations face substantial repression from the state. As a consequence, for cooperation to emerge and persist when it is most valuable, militant groups must have means of committing to cooperation even when the incentives to defect are high. We posit that shared

The era of American leadership in the multilateral trading regime has ended. This paper argues that this current antipathy to trade is unsurprising: support for US leadership of the regime has always rested on a precarious balance among domestic interests. To overcome a historic bias in favor of home market production, American leaders created incentives for exporters to organize while creating roadblocks

Recent research has shown that inequality between ethnic groups is strongly driven by politics, where powerful groups and elites channel the state's resources toward their constituencies. Most of the existing literature assumes that these politically induced inequalities are static and rarely change over time. We challenge this claim and argue that economic globalization and domestic institutions interact

The rise of top-heavy inequality—earnings concentration in a very thin layer of elites—calls into question our understanding of the distributional effects of the Liberal International Order. Far more people lose from globalization, and fewer gain, than traditional economic models suggest. We review three modern trade theories (neo-Heckscher-Ohlin-Stolper-Samuelson or H-O-S-S, new new trade theory,

American politicians repeatedly and strenuously invoke concerns about fairness when pitching their trade policies to their constituents, unsurprisingly since fairness is one of the most fundamental and universal moral concepts. Yet studies to date on public opinion about trade have not been designed in such a way that they test whether fairness is important, nor whether the mass public applies fairness