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Do international systems tend to remain anarchic because of recurring balances of power, or do they tend toward imbalances and hierarchy? Leading structural theories posit competing predictions about systemic outcomes, and the historical record offers evidence to support both claims. This suggests the need to theorize conditions under which one tendency or another is likely to dominate and what factors lead systems to transition from one state to another. We draw on constructivist and English School insights about international authority and legitimacy to develop such a framework. We conceive of patterns of international authority as structures independent from, and interacting with, mechanisms usually associated with international anarchy, such as the balance of power. We propose that international authority systems vary along two dimensions: particularist cosmopolitan and substitutable nonsubstitutable. Both are emergent properties of ideas and institutions located at the unit level. We argue that certain authority systems - particularist and nonsubstitutable - reinforce, and are reinforced by, anarchy and balanced distributions of capabilities. Others - cosmopolitan substitutable - facilitate rollup and domination and are likely to emerge or be maintained in hierarchic and highly asymmetric systems. By offering a structural account of international authority, we hope to contribute to the global turn in international relations, offering a framework for comparing systems across time and space. We also aim to help make sense of contemporary struggles over norms and values, their structural causes and consequences, and their potential implications for the future of global power politics.

The explosion of cities and megacities has increased scholars' and policy markers' attention to the effects such changes might have on conflict: increasingly, urban environments may alter the nature of warfare but not necessarily the incidence of intrastate war. We argue that high levels of urban concentration—the concentration of populations in one or relatively few urban centers—increases both the likelihood of civil wars and their intensity. Urban concentration limits the ability of the state to project power across space, exacerbating grievances in rural areas, easing rebel control of territory, and enhancing their military strength. At the same time, cities become high-value loci of contestation even as urban warfare constrains conventional state military strength. The result is more symmetrical fighting producing more battle deaths. Cross-national regressions show that urban concentration exerts a crucial effect on the likelihood, nature, and intensity of intrastate warfare.

What inroads is China making in Latin America? In China Engages Latin America, experts from three continents provide local answers to this global question. The authors explore the multiple motivations driving the establishment of new Sino–Latin American linkages, the nature of those linkages, and the reactions that they have generated. They also examine how China–Latin America relations have developed over more than two hundred years. The result is a work that deals with key issues of broad regional relevance, as well as country-specific political, economic, and cultural concerns