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Mark L. Haas
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Journal Articles
Publisher: Journals Gateway
International Security (2021) 46 (1): 104–146.
Published: 19 July 2021
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Why is it that international ideological enemies—states governed by leaders engaged in deep disputes about preferred domestic institutions and values—are sometimes able to overcome their ideological differences and ally to counter shared threats, and sometimes they are not? Alliances among ideological enemies confronting a common foe are unlike coalitions among ideologically similar states facing comparable threats. Members of these alliances are perpetually torn by two sets of powerful contending forces. Shared material threats push these states together, while the effects of ideological differences pull them apart. To predict when ideological enemies are and are not likely to ally in the pursuit of common interests, it is necessary to know which of these contending forces is likely to dominate at a particular time. The values of two ideological variables beyond that of ideological enmity play the key role in determining outcomes: (1) states’ susceptibility to major domestic ideological changes and (2) the nature of the ideological differences among countries. Similar levels of ideological enmity and material threats will have vastly different effects on leaders’ alliance policies as the values of these additional ideological variables alter.
Journal Articles
Publisher: Journals Gateway
International Security (2019) 43 (3): 53–95.
Published: 01 February 2019
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The world is experiencing a period of unprecedented demographic change. For the first time in human history, marked disparities in age structures exist across the globe. Around 40 percent of the world's population lives in countries with significant numbers of elderly citizens. In contrast, the majority of the world's people live in developing countries with very large numbers of young people as a proportion of the total population. Yet, demographically, most of the world's states with young populations are aging, and many are doing so quickly. This first-of-its kind systematic theoretical and empirical examination of how these demographic transitions influence the likelihood of interstate conflict shows that countries with a large number of young people as a proportion of the total population are the most prone to international conflict, whereas states with the oldest populations are the most peaceful. Although societal aging is likely to serve as a force for enhanced stability in most, and perhaps all, regions of the world over the long term, the road to a “demographic peace” is likely to be bumpy in many parts of the world in the short to medium term.
Journal Articles
Publisher: Journals Gateway
International Security (2016) 40 (3): 197–215.
Published: 01 January 2016
Journal Articles
Publisher: Journals Gateway
International Security (2007) 32 (1): 112–147.
Published: 01 July 2007
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In the coming decades, the most powerful states in the international system will face a challenge unlike any experienced in the history of great power politics: significant aging of their populations. Global aging will be a potent force for the continuation of U.S. economic and military dominance. Aging populations are likely to produce a slowdown in states' economic growth at the same time that governments will face substantial pressure to pay for massive new expenditures for elderly care. This economic dilemma will create such an austere fiscal environment that the other great powers will lack the resources necessary to overtake the United States' huge power lead. Moreover, although the U.S. population is growing older, it is doing so to a lesser extent and less quickly than all of the other major actors in the system. Consequently, the economic and fiscal costs created by social aging—as well as their derivative effects on military spending—will be significantly lower for the United States than for potential competitors. Nevertheless, the United States will experience substantial new costs created by its own aging population. As a result, it will most likely be unable to maintain the scope of its current international position and will be less able to realize key international objectives, including preventing the proliferation of weapons of mass destruction, funding nation building, and engaging in military humanitarian interventions.