International relations
Religion

Religion can have an effect on the way a state acts within the international system, and different theoretical perspectives treat it in somewhat different fashion. One dramatic example is the Thirty Years' War (1618–1648) that ravaged much of Europe, which was at least partly motivated by theological differences within Christianity. Religion is a major organizing principle particularly for Islamic states, whereas secularism sits at the other end of the spectrum, with the separation of state and religion being responsible for the liberal international relations theory. The September 11 attacks in the United States, the role of Islam in terrorism, and religious strife in the Middle East have made the role of religion in international relations a major topic. China's reemergence as a major international power is believed by some scholars to be shaped by Confucianism.
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