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"Territory, Contentious Issues, and International Relations" published on by Oxford University Press.

The Issue Correlates of War (ICOW) research project began nearly 20 years ago by collecting data on territorial claims in South America. Since then, the ICOW territorial claims dataset has expanded to cover the entire world, while ICOW has collected new data on river claims and maritime claims and is beginning a new project on identity claims. This article discusses the development and expansion of ICOW data, illustrating how the additional datasets offer important new information and open up new avenues for scholarship.

This article describes the first complete release of the Issue Correlates of War (ICOW) Territorial Claims dataset, which covers all interstate territorial claims between 1816 and 2001. Territory can have substantial tangible and intangible value for states, and competing claims for control of territory represent one of the leading sources of interstate conflict. The dataset identifies 843 territorial claims and includes measures of the salience of the claimed territory, as well as details of the militarization and ending of each claim. Beyond a discussion of the structure and contents of the dataset and the coding procedures that were used to generate it, this article also presents descriptive analyses of the dataset. These analyses highlight important patterns across time and space, including changes in the prevalence, frequency of initiation, salience, militarization, and resolution of territorial claims. Notable patterns include recent declines in the frequency with which claims tend to become militarized and a lower prevalence of tangible salience measures such as natural resources. The regional distribution of claims has also shifted markedly over time, from a historical concentration in Europe towards Asia, where by 2001 claims were far more prevalent than in any other region. The article concludes with suggestions for future research.