Jr. Oneal et al., THE LIBERAL PEACE - INTERDEPENDENCE, DEMOCRACY, AND INTERNATIONAL CONFLICT, 1950-85, Journal of peace research, 33(1), 1996, pp. 11-28
The classical liberals believed that democracy and free trade would re
duce the incidence of war. Here we conduct new tests of the 'democrati
c peace', incorporating into the analyses of Maoz & Russett (1993) a m
easure of economic interdependence based on the economic importance of
bilateral trade. This allows us to conduct a simultaneous evaluation
of the effects of regime type and interdependence on the likelihood th
at a pair of states will become involved in a militarized interstate d
ispute. We control in all our analyses for a number of potentially con
founding influences: growth rates in per capita income, alliances, geo
graphic contiguity, and relative power. Our logistic regression analys
es of politically relevant dyads (1950-85) indicate that the benefits
of the liberals' economic program have not been sufficiently appreciat
ed. Trade is a powerful influence for peace, especially among the war-
prone, contiguous pairs of states. Moreover, Kant (1991 [1795]) was ri
ght: International conflict is less likely when external economic rela
tions are important, executives are constrained, and societies are gov
erned by non-violent norms of conflict resolution.