Abstract
This article examines various implications of democratic peace theory in both the contemporary era and in Greece during the Peloponnesian War era. It considers the evidence for various hypotheses in both contexts, to understand why those hypotheses — especially those concerning institutions — find much better support in the contemporary era. It also addresses the causes and possible consequences of expansionist policies, including hypotheses that democracies are more effective war-fighters and thus better able to pursue successful expansion by military means.
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