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Article

Economic Interdependence and Conflict  

Hyo Joon Chang and Scott L. Kastner

Recent studies on commercial liberalism have paid more attention to microfoundations linking economic interdependence to peace. Using a bargaining model of war, these studies have specified and tested different causal mechanisms through which economic ties function as a constraint, a source of information, or a transformative agent. Recent scholarly efforts in theoretical development and some empirical testing of different causal processes suggest the need to consider scope conditions to see when an opportunity cost or a signaling mechanism is likely to be salient. Future research can be best benefited by focusing on how economic interdependence affects commitment problems and empirically assessing the relative explanatory power of different causal arguments.

Article

Territory, Contentious Issues, and International Relations  

Paul R. Hensel

Territorial issues have been prominent causes of armed conflict and war in the modern era. This observation has led to a rapidly growing body of academic literature on the sources, management, and consequences of such issues. Although territory has gotten most of the scholarly attention, this literature has its roots in research on contentious issues that began in the 1960s. Academic research on contentious issues began with studies on issue areas in foreign policy analysis, focusing on such questions as how the foreign policy process differs from more traditional domestic policy processes. This line of research struggled to find mainstream acceptance until scholars began adopting a more substantive conception of issues, focusing on the nature of the values at stake. General patterns of foreign policy conflict and cooperation have been found to differ substantially across different issues. Importantly, territorial issues are the most frequent and most dangerous issues in armed conflict and war, leading scholars to focus much of their issue-related research on the dynamics of territorial contention. Research on territory has stemmed from the main elements of issues theory that were developed earlier: issue salience, or the importance of the issue under contention; issue context, or recent interactions over the same issue; and institutional context, or the extent to which other actors and institutions are able to influence contention over this type of issue. Armed conflict is much more likely when the issue at stake is more salient, particularly when this salience involves intangible dimensions such as the presence of a state’s ethnic kin in the claimed territory. Greater issue salience also increases the likelihood of peaceful negotiations and nonbinding conflict management techniques like mediation. A recent history of armed conflict or failed negotiations over an issue increases the likelihood of armed conflict, bilateral negotiations, and nonbinding management. The normative and institutional context also appears to affect the likelihood of conflict and peaceful management over issues, although more remains to be done in this area. The issues literature is beginning to make important strides beyond this initial work on territorial claim management. Scholars are beginning to geocode data on international borders, raising important potential benefits for the study of territory and perhaps other issues. International legal arguments appear to affect the management of territorial claims in systematic ways, and ending territorial claims seems to produce substantial improvements in relations between the former adversaries. The same general patterns seem to hold for river and maritime issues, as well as territorial issues, and these other issue types have more promising institutional contexts. Future research could benefit from considering additional issue types (including a recent effort to collect data on identity claims), as well as studying domestic and interstate issues.

Article

The Latin American Puzzles for the Study of International Relations  

David R. Mares

Puzzles for the scholar of international relations abound in Latin America, whether one focuses on unexpected outcomes or examines purported causal variables that, when properly specified, do not lead where theory expects. In fact, the Latin American experience is a great case to illustrate two problems in the empirical application of international relations theories: theoretical formulations tend to be poorly developed and articulated, and the empirical evaluations of those theories are not rigorously designed. The empirical record of Latin American interstate violence is more present and varied than generally accepted by scholars and policy makers. The relationship between conflict and the region’s use of international fora to peacefully resolve some conflicts obscures this record. Puzzles also arise when explaining why the region has the empirical record it does since the causal logic underlying the variables is generally misspecified in studies of Latin American security relations. These analytic errors render most explanations offered in the literature drawing on Latin American cases incorrect. Indeed, the failed explanations themselves offer new puzzles for scholars of international relations. Scholars of international relations can, therefore, benefit from studying the actual empirical history of Latin American interstate relations with the correctly specified causal variables offered by the various theories of international relations.

Article

Managing Internationalized Civil Wars  

Erin K. Jenne and Milos Popovic

In their seminal study “Resort to Arms,” Small and Singer (1982) defined a civil war as “any armed conflict that involves (a) military action internal to the metropole, (b) the active participation of the national government, and (c) effective resistance by both sides.” Internationalized civil wars constitute a newer classification, denoting a conflict involving organized violence on two or more sides within a sovereign state, in which foreign elements play a role in instigating, prolonging, or exacerbating the struggle. Small and Singer defined civil war as one in which a “system member” intervenes into a substate conflict involving organized violence. Although Singer and Small conceived “system members” narrowly as external sovereign states engaged in military intervention into the civil war in question, the definition has since been expanded by the Peace Research Institute Oslo (PRIO) and Uppsala Conflict Data Program (UCDP) to include other foreign actors—such as nonstate or private actors, diasporas, IOs, corporations, or cross-border kin groups—any of which can intervene to intensify a domestic civil conflict. From superpower interventions during the Cold War to more recent conflicts in Syria and Ukraine, internationalized civil wars have garnered increasing scholarly attention, primarily because they tend to be far bloodier and more protracted than noninternationalized civil wars. How to end such wars is a problem long bedeviling the international community. Civil wars are already more difficult to end than interstate wars partly because there are more players to satisfy in civil war settings, with multiple conflict parties coexisting on a single territory, and multiple factions within each conflict party—each constituting a “veto player” that might plausibly spoil a peace agreement should the agreement not satisfy their needs. This problem is exacerbated by an order of magnitude when a civil war becomes internationalized. When outside actors get involved in a civil war, the number of veto players rises correspondingly to include not only domestic players and internal factions, but also the involved external players, which may include foreign governments, diaspora groups, foreign fighters, and/or transnational social networks. Managing or ending internationalized civil wars is thus a highly complicated balancing act requiring attention not just to internal, but also to external veto players represented by all involved parties both inside and outside the conflict state. The traditional methods of conflict management involve electoral engineering, power-sharing arrangements, or other peace deals that seek to satisfy the aspirations of involved internal parties, while ensuring that the peace deal is “self-enforcing.” This means that it will hold up even in the absence of outside pressure. In internationalized civil wars, however, conflict managers must also satisfy involved outside actors or otherwise neutralize external conflict processes. There are multiple methods for doing this, ranging from effective border control in cases of conflict spillover to decomposing internationalized conflicts into civil and international conflicts, which are solved separately, to outright peace enforcement involving international security guarantees.

Article

Suicide Terrorism Theories  

Susanne Martin and Ami Pedahzur

Suicide terrorism has captured considerable attention since the attacks on September 11, 2001. Governments offered unprecedented support for scholars who were willing to research the phenomenon. One result has been a tremendous growth in the volume of research on terrorism. The research has also become more diverse. Until 2001, 84% of the articles appeared within the disciplines of political science and international relations. Since 2002, though, only 53% of articles belonged to these disciplines. Meanwhile, other areas (most notably economics) increased in prominence. Despite the growth in the volume and diversity of the research, important aspects of the phenomenon remain largely unexplored. This is particularly evident when it comes to studies of suicide terrorism. Two areas requiring further attention include the “theater of terrorism” and the role of culture. The case of ISIS demonstrates the significant roles of the mass media and culture in explaining contemporary suicide terrorism.

Article

Do We Have Too Much Theory in International Relations or Do We Need Less? Waltz Was Wrong, Tetlock Was Right  

Michael D. Ward

The field of international relations has developed the notion that world politics is made up of dyads, a thing that no one has actually ever seen. This notion is referred to as a theory by many scholars. Both the notion that world politics is dyadic as well as the idea that this is a theory need to be jettisoned from our scholarship. They have deleterious effects on what we can learn about the world.

Article

Conflict, Regions, and Regional Hierarchies  

Thomas J. Volgy, Kelly Marie Gordell, Paul Bezerra, and Jon Patrick Rhamey, Jr.

Despite decades of scholarly attention to conflict and cooperation processes in international politics, rigorous, comparative, large-N analyses of these questions at the region level are difficult to find in the literature. Although this relative absence may stem in part from the difficulties related to the theoretical conceptualization or methodological operationalization of regions, it certainly is not for lack of interesting variation in terms of conflict and cooperation processes across regions. Between this variation and recent contributions toward a dynamic identification of regions, comparative analysis of conflict and cooperation outcomes at the region level are primed for exploration and increasingly salient as recent political elections in the United States (Trump election) and the United Kingdom (Brexit) have demonstrated a willingness on the part of policymakers to scale back efforts toward global interdependence. Turning attention to a region level unit of analysis, however, does not require abandoning decades of scholarship at the state or dyad levels. Indeed, much of this work may be viewed as informing or complementary to comparative regional analyses. In particular, regional propensity for cooperation or conflict is likely to be conditioned by a number of prominent explanations of these phenomena at state and dyad levels, which may usefully be conceived in their regional aggregates as so-called regional fault lines or baseline conditions. These include the presence of major and/or regional powers, interstate rivalries, unresolved territorial claims, civil wars, regime similarity, trade relationships, and common membership in intergovernmental organizations. Of these baseline conditions, the impact of major and regional powers on regional patterns of cooperation and conflict is notable for both its theoretical and practical implications. Power transition theory, hegemonic stability theory, hierarchical theory, and long cycle theory all suggest major—and to a lesser extent regional—powers will seek to establish order within areas under their influence; alternatively, the overwhelming capabilities these states bring to a region arguably act as a deterrent inhibiting conflict. Empirical analysis reveals—irrespective of the causal mechanism at hand—regions characterized by the presence of a major or regional power experience less conflict. Moving forward, future research should work to test the two plausible causal mechanisms for this finding—order building versus deterrence—to determine the true nature of hierarchy’s pacifying influence.

Article

Civil War from a Transnational Perspective  

Kristian Skrede Gleditsch

Civil war is the dominant form of armed conflict in the contemporary international system, and most severe lethal armed conflicts in the post-Cold War era have been civil/intrastate rather than interstate. Still, it would be misleading to see these conflicts as purely domestic, as many contemporary civil wars such as Syria display clear transnational characteristics, including inspirations from events in other countries, links to actors in other countries, as well as international interventions. Moreover, civil wars often have important implications for other states, including security concerns and economic impacts. There is a need to focus on the growth and core findings in the literature on transnational dimensions of civil war, in particular on how factors outside a particular state can influence the risk of conflict within states as well as some of the central consequences of domestic conflict for other states or relations between states. This line of research has helped expand our understanding of both civil conflict and interstate war, and that a comparative focus on varieties conflict and attention to the possible transnational dimensions of civil war deserve a prominent role in future research.

Article

Capitalist Peace Theory: A Critical Appraisal  

Gerald Schneider

Capitalist peace theory (CPT) has gained considerable attention in international relations theory and the conflict literature. Its proponents maintain that a capitalist organization of an economy pacifies states internally and externally. They portray CPT either as a complement to or a substitute for other liberal explanations, such as the democratic peace thesis, but disagree about the facet of capitalism that is supposed to reduce the risk of political violence. Key contributions have identified three main drivers of the capitalist peace phenomenon: the fiscal constraints that a laissez-faire regimen puts on potentially aggressive governments, the mollifying norms that a capitalist organization creates, and the increased ability of capitalist governments to signal their intentions effectively in a confrontation with an adversary. CPT should be based on a narrow definition of capitalism and should scrutinize motives and constraints of the main actors more deeply. Future contributions to the CPT literature should pay close attention to classic theories of capitalism, which all considered individual risk taking and the dramatic changes between booms and busts to be key constitutive features of this form of economic governance. Finally, empirical tests of the proposed causal mechanism should rely on data sets in which capitalists appear as actors and not as “structures.” If the literature takes these objections seriously, CPT could establish itself as central theory of peace and war in two respects: First, it could serve as an antidote to “critical” approaches on the far left or far right that see in capitalism a source of conflict rather than of peace. Second, it could become an important complement to commercial liberalism that stresses the external openness rather than the internal freedoms as an economic cause of peace and that particularly sees trade and foreign direct investment as pacifying forces.

Article

The Two-Good Theory in Practice: From Abstract Generalization to Specific Inference  

T. Clifton Morgan and Glenn Palmer

The “two-good theory” is a theory of foreign policy that is meant to apply to all states in all situations; that is, it is general. The theory is simple and assumes that states pursue two things in theory with respect to foreign policies: change (altering aspects of the status quo that they do not like) and maintenance (protecting aspects of the status quo that they do like). It also assumes that states have finite resources. In making these assumptions, the theory focuses on the trade-offs that states face in constructing their most desired foreign policy portfolios. Further, the theory assumes that protecting realized outcomes is easier than bringing about desired changes in the status quo. The theory assumes that states pursue two goods instead of the more traditional one good; for realism, that good is “power,” and for neorealism, it is “security.” This small step in theoretical development is very fruitful and leads to more interesting hypotheses, many of which enjoy empirical support. The theory captures more of the dynamics of international relations and of foreign policy choices than more traditional approaches do. A number of empirical tests of the implications of the two-good theory have been conducted and support the theory. As the theory can speak to a variety of foreign policy behaviors, these tests appropriately cover a wide range of activities, including conflict initiation and foreign aid allocation. The theory enjoys support from the results of these tests. If the research relaxes some of the parameters of the theory, the investigator can derive a series of corollaries to it. For example, the initial variant of the theory keeps a number of parameters constant to determine the effect of changes in capability. If, however, the investigator allows preferences to vary in a systematic and justifiable manner (consistent with the theory but not established by the theory), she can see how leaders in a range of situations can be expected to behave. The research strategy proposed, in other words, is to utilize the general nature of the two-good theory to investigate a number of interesting and surprising implications. For example, what may one expect to see if the United States supplies a recipient state with military aid to counter a rebellion? Under reasonable circumstances, the two-good theory can predict that the recipient would increase its change-seeking behavior by, for instance, engaging in negotiations to lower trade barriers.

Article

American Grand Strategy and Political Economy Theory  

Kevin Narizny

Nearly everything a state does has distributional consequences, including grand strategy. Societal groups with different stakes in the international economy and defense spending often have conflicting strategic priorities, and these groups pursue their parochial interests by supporting the nomination and election of like-minded politicians. Thus, grand strategy is a product of political economy. An overview of American foreign policy over the last several decades illustrates this logic. In the 1980s, the Democratic and Republican coalitions had conflicting interests over the international economy, so the two parties diverged on grand strategy. The recovery of the Rust Belt in the 1990s and 2000s, however, brought increasing convergence. Political discourse over foreign policy was fiercely partisan, but, with the notable exception of George W. Bush’s decision to go to war in Iraq in 2003, the two parties shared essentially the same view of America’s role in the world. The disastrous outcome in Iraq led the Bush administration back to the middle ground in its second term, and Obama followed the same course. In contrast, the election of Donald Trump augurs change. Trump’s electoral coalition consists of a different balance of interests in the international economy than that of past Republican presidents, so he is likely to pursue different strategic priorities.

Article

Strategic Culture Theory: What, Why, and How  

Edward Lock

The concept of strategic culture has become widely used in the field of international relations, primarily in the context of efforts to explain the distinctive strategic behaviors of states through reference to their unique strategic properties. Despite this, a great deal of confusion remains regarding what strategic culture is, and how it may be used in the context of academic research. Two problems produce this confusion: much strategic culture literature continues to conflate culture-as-ideas with the behavior and artifacts through which those ideas become manifest, and strategic culture scholars have incorporated within their definitions of this concept overly narrow assumptions about where strategic culture may be said to exist. To address these weaknesses in the literature, strategic culture is redefined as consisting of common ideas regarding strategy that exist across populations. This definition is narrower than many because it defines culture as common ideas rather than as ideas plus behavior (or as ideas plus artifacts). This matters not because it solves the methodological challenges faced by those who seek to study ideas, but because it forces us to confront these challenges directly in the context of efforts to understand the different ways that patterns of ideas may produce patterned behavior. This definition is also broader than many because it refuses to dismiss the possibility that common ideas related to strategic matters may exist across populations that are not bounded by the borders of existing countries. The rationale for such an approach is simply that one ought to look and see how common ideas are in fact distributed across populations, rather than assume that patterns will conform to taken-for-granted political units.

Article

Evolution, Adaptation, and Imitation in International Relations  

Richard Ned Lebow

Evolution, as a biological process and a metaphor, has utility in our understanding of international relations. The former is largely inapplicable for obvious, conceptual, and empirical reasons; but the latter is more promising, though those who use it must be explicit about its limitations. There must be considerations on how evolution contrasts with conscious adaption and imitation, on the argument for the need to distinguish among them analytically and empirically, and on the further exploration of the different conditions in which these other two mechanisms might be relevant.

Article

Hierarchy and International Relations: Theory and Evidence  

David A. Lake

The literature on international hierarchy is emerging as a progressive research program. This new theory of international relations is generating novel propositions that are being empirically confirmed. Some propositions, like the hierarchical peace, provide new explanations for previously identified phenomena. Other propositions on defense spending, crisis joining,e trade, and civil wars and repression establish new empirical relationships that—if they are not actually inconsistent with existing theories—were not previously identified. If the measure of progress is the uncovering of new facts, the new hierarchy studies are clearly moving in the right direction. Further progress requires more and better measures of hierarchy and continued testing of propositions derived from the theory.

Article

Diplomacy and Negotiation by the Numbers: More Than An Art Form?  

Mark A. Boyer and Michael J. Butler

One of the long-standing debates between diplomatic historians and social scientists focusing on diplomacy and negotiation turns on what we know and how we know it. While diplomatic history points to the necessity of micro-level approaches rooted in the details of discrete and idiosyncratic negotiations and interactions, social science strives to identify broad aggregate patterns gleaned from a cross section of such activities. The primary benefit of the latter approach is the same as this volume: namely, the advancing of empirically grounded theory. This disjuncture in the study of diplomacy and negotiation helps explain why international relations as a field has spent so little time studying diplomacy—and, as a result, why negotiation and diplomacy remains undertheorized. The overarching objective of this entry is to draw attention to contributions to the negotiation theorizing gleaned from the macro-level social scientific analysis of diplomacy and negotiation. Undoubtedly the range, depth, and quality of this work exceeds its visibility within the mainstream study of negotiation. By necessity, we have elected to draw connections between some of the more prominent examples of the quantitative empirical study of negotiation processes and outcomes and prevailing theoretical arguments in the field of international negotiation and cooperation. In doing so, we hope to draw attention to if not help close the gap between theory and practice in the study of negotiation and diplomacy.

Article

Fractionalization and Civil War  

Kathleen Gallagher Cunningham

Civil wars have becoming increasingly complex in the last 50 years, the role of fragmentation in contemporary civil wars needs to be addressed. Two primary dimensions of fractionalization are: (1) fragmented conflict (i.e., those with many different actor) and (2) fragmented actors (i.e., internally divided “sides” of a conflict). In addition to the two types of fragmentation, there are also various causes of fragmentation. The primary causes of fractionalized conflicts are rooted in the interplay between opposition actors and the government, and among opposition actors. Peace negotiations, accommodation, and the process of war all put stress on opposition actors (and to perhaps a more limited extent, on governments). Lastly, there is a set of conflict-related outcomes and processes that have been linked empirically to fractionalization. These include accommodation of opposition demands, higher rates of violence (against the state and civilians), infighting, duration of conflict, and side-switching.

Article

Understanding Ethnic Conflict: Four Waves and Beyond  

Shiping Tang

The past four decades have witnessed an explosion of research into ethnic conflict. The overarching question addressed in the voluminous and still growing literature is this: Under what cultural, social, economic, political, and international conditions is ethnic conflict or peace more likely? Limiting my survey to the onset of ethnic war, I divide the literature into four waves and critically examine its theoretical and empirical progress. I contend that the field has indeed made impressive progress, both theoretically and empirically. Theoretically, the field has moved well beyond the unproductive debate of the three paradigms (i.e., primordialism, instrumentalism, and constructivism), and there is an emerging consensus that we need to draw valid elements from all three paradigms and beyond. In addition, neo-institutionalism has (re-)emerged as a major approach in the field. Empirically, powered by increasingly sophisticated methods and technologies such as the Geography Information System (GIS) and the availability of more and better datasets, inquiries into ethnic conflict have not only ventured into exciting new territories but also gained deeper and fine-grained knowledge into the causes of ethnic war. I then highlight several recent studies that bring out impressive theoretical and empirical syntheses that may well portend better things to come. Finally, I identify several venues for further scientific progress, including tighter coupling between theorization and empirical hypotheses, getting the basics of methods right, gathering more fine-grained data that measure the level of ethnic politics, bringing together ethnic politics and other key topics in the wide social sciences, and forecasting the risk of ethnic war based on computational social sciences.

Article

What Do We Know About Civil War Duration? A Bargaining Perspective  

David E. Cunningham

Civil wars vary greatly in duration—some end within months; others last for decades. What explains this variation? Civil wars drag on when no combatant can win a military victory and the various actors involved are unable, or unwilling, to reach a compromise agreement that resolves the war. Military victory does happen in civil war, but it is rare, so understanding why civil wars last as long as they do requires examining the barriers to negotiated settlement. Wars last longer when the parties involved perceive the war as less costly relative to peace and when the combatants are overly optimistic about how they will do in the war. Even when key decision-makers see the war as costly and are realistic about their chances of prevailing, negotiated settlements prove elusive if the parties cannot accept a division of the issues at stake or if the government or rebels are unable to trust the commitments the other side makes in a negotiation. Additionally, bargaining is more complicated when there are more combatants that must accept the terms of any agreement, and conflicts with more combatants last much longer than those with fewer. Many factors affect the bargaining environment, and these barriers to bargaining can explain why civil wars are on average quite long. International actions can alleviate some of the barriers and help combatants reach comprehensive settlements, as happened in the conflicts in Mozambique, El Salvador, Guatemala. In particular, peacekeeping and mediation strategies are effective at resolving wars sooner. International action in general is more effective, however, when the parties involved are interested in peace but need some help overcoming commitment or informational problems. These actions are much less successful when that interest is lacking. The current civil war in Syria has many of the factors identified as prolonging wars. It is an extremely fractionalized conflict, and many external actors are involved. Syria has a large majority population that has been historically excluded from political power and economically marginalized, and a minority government that has been dominant. These factors make reaching a comprehensive settlement very challenging and mean the war is likely to be very long-lasting.

Article

Long Cycle and World-Systems Theoretical Research Programs  

Christopher Chase-Dunn and Hiroko Inoue

Substantial overlaps are found between world-systems and long-cycle theoretical research programs in this study of the emergence and growth of sociocultural complexity and hierarchy. Although these two approaches have different theoretical ancestors and significantly different conceptual vocabularies, they mainly converge with regard to crucial elements such as units of analysis and changes in the distribution of power.

Article

Immigration and International Political Economy  

Margaret E. Peters

Immigration has largely been neglected as part of the study of International Political Economy (IPE) until recently. Currently, IPE scholars have focused on two questions regarding immigration: what explains variation in public opinion on immigration and what explains variation in immigration policy. The scholarship on public opinion on immigration has largely been divided into two camps, those who argue that economic factors drive opinion and those who argue that cultural factors are the driver. Those who study the role economic factors have played in shaping opinion on immigration often start with the Stolper-Samuelson theorem. The Stolper-Samuelson theorem shows that while immigration increases the overall size of the economy, it has different distributional effects. Immigration increases the size of the labor pool and, thus, should increase the returns to capital while decreasing wages. As such, those who derive most of their income from capital should favor immigration while those who derive most of their income from wages should oppose immigration. Additionally, the Stolper-Samuelson model shows that openness to trade should have the same effects as open immigration; thus, people should oppose or favor both trade and immigration. Early scholarship examined these predictions and found that opposition to immigration was much higher than opposition to trade and that those who derive much of their income from capital also oppose immigration at high rates. In response, one set of scholars focused on the additional costs that immigration, but not trade, brings. Immigrants, unlike goods, may place a burden on the social welfare system and thus, opposition to immigration especially by the wealthy may be driven by these costs. Other scholars noted that immigrants work in many industries that are unaffected by trade—most notably the service sector—and this may explain opposition to immigration. Finally, a third group has argued that opposition to immigration is largely driven by cultural concerns and xenophobia. Currently, this debate continues with both sides examining more nuanced survey data. Scholarship on immigration policy has similar divides. Immigration policy has become more restrictive since the late 19th and early 20th centuries, when most countries had very few restrictions on immigration. To explain these restrictions, one school of scholars has argued that labor unions oppose immigration, as it hurts the wages of their members. As unions gain strength, immigration should become more restricted. Others focus on the rise of the welfare state, arguing that immigration has been restricted to keep costs low. A third group has argued that greater political rights in the early and mid-20th century for the generally xenophobic working class has led to the restrictions. Finally, new scholarship argues that increased globalization—in the form of increased trade and increased foreign direct investment—has sapped business support for immigration, which has allowed anti-immigrant groups to have more say. Using a wealth of newly collected data, scholars are testing these different theories.