Domestic Structure and Preventive War: Are Democracies More Pacific?

Abstract

Realists have long viewed uneven rates of growth among states as a major cause of wars. According to strict logic of realpolitik, a declining dominant power should launch a preventive war against a rising challenger as a prudent long-term security strategy. But historically, power shifts have only sometimes resulted in war. Although preventive war has been the preferred response of declining authoritarian leaders, no democracy has ever initiated such a war. Instead, depending on the regime type of the rising challenger, democratic states have chosen accommodation, defensive alliances, or internal balancing to solve the problem of impending decline. In addition to establishing the correlation between preventive war and authoritarian regimes and explaining why democratic states forgo this option, this essay (1) develops a model based on the domestic structures of the leader and challenger that predicts which strategy will be employed by a declining dominant power and (2) tests the propositions against historical survey data and several in-depth case studies.