A theory of international relations is a set of ideas that explains how the international system works. Unlike an ideology, a theory of international relations is (at least in principle) backed up with concrete evidence. The two major theories of international relations are realism and liberalism. National Interest Most theories of international relations are based on the idea that states always act in accordance with their national interest, or the interests of that particular state. State interests often include self-preservation, military security, economic prosperity, and influence over other states. Sometimes two or more states have the same national interest. For example, two states might both want to foster peace and economic trade. And states with diametrically opposing national interests might try to resolve their differences through negotiation or even war. Realism According to realism, states work only to increase their own...
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