Network Polarization, Network Interdependence, and International Conflict, 1816-2002

This study examines the effect of polarization and interdependence on systemic conflict. It argues that both polarization and interdependence must be conceptualized in terms of different types of relations among states and that different relationships would reflect varied levels of polarization and interdependence. Accordingly, this study develops general measures of network polarization and interdependence that allow measurement of these concepts over a wide array of international relations. Hypotheses are deduced from the realist and liberal paradigms about how alliance polarization, trade polarization, and cultural polarization affect systemic conflict. Likewise, hypotheses are deduced regarding the expected effects of strategic and economic interdependence on conflict. These hypotheses are tested using data on alliance, trade, linguistic, and religious networks over the period 1816—2002. The findings suggest that alliance polarization and strategic interdependence increase the amount of systemic conflict, while trade polarization and economic interdependence have a dampening effect on the amount of conflict in the international system. The theoretical implications of these results are discussed.