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The widely documented dyadic democratic peace observation has led to optimism that the spread of democracy might prove pacifying even outside of democratic dyads. Yet, tensions between the logic of liberal peace in dyads and systems suggest that economic development may be better suited than democracy as a determinant of systemic liberal peace. In particular, regime type heterogeneity (difference) stands to increase conflict at the system level. We argue that there exists a systemic developmental peace, in which increased wealth encourages powerful developed nations to discourage other countries from fighting, even as these same developed states continue to use force in service of their own private objectives. We also separate out the effects of aggregate democracy from regime type difference in our analysis. Systemic and cross-level statistical tests support the following propositions: greater systemic development encourages peace, difference propagates war, and increased systemic democracy has no consistent impact on interstate conflict.
