Proponents of the controversial democratic peace theory claim that strong empirical evidence exists that democracies never or rarely wage war against each other. Several researchers find no wars between well-established liberal democracies.^[6] Jack Levy (1988) made an oft-quoted assertion that the theory is "as close as anything we have to an empirical law in international relations".

An increasing number of nations have become democratic since the industrial revolution. A world peace may thus become possible if this trend continues and if the democratic peace theory is correct.^{[citation needed]}

There are, however, several possible exceptions to this theory.

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