New Tests of the Democratic Peace: Controlling for Economic Interdependence, 1950-85

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Abstract
Maoz and Russett (1993) reported that democratic states after World War II were unlikely to engage in militarized disputes with one another, but their continuous measure of joint democracy is problematic. It can decrease if one of a pair of states becomes more democratic, even if the political regime of the other does not change. Thus, results using this index are difficult to interpret. In this study we estimate the likelihood of dyadic conflict using more straightforward indices of joint democracy As in Oneal, Oneal, Maoz, and Russett (1996), we control for economic in terdependence and several other theoretically interesting, potentially con founding influences. Our analyses indicate that the more democratic a pair of states, the less likely they are to become involved in a militarized dispute; but a high level of democracy in one state can not compensate for less democracy in a strategic partner. The political distance separating states along the democracy-autocracy continuum is an important indica tor of the likelihood of dyadic conflict: democracies are unlikely to fight other democracies, but democracies and autocracies are conflict-prone. These results indicate that, ceteris paribus, democratic states are more peaceful than autocracies at the national level of analysis.

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