study of the relations among states and other political and economic units in the international system. Particular areas of study within the field of international relations include diplomacy and diplomatic history, international law, international organizations, international finance and economics, and communications, among others. In addition, increased attention has been paid in recent years to developing a more scientific understanding of the international system as a whole. Aspects of international relations have been studied as early as the time of the ancient Greek historian Thucydides. As a separate and definable discipline, however, it dates from the early 20th cent., when the first organized efforts were made to find alternatives to wars in nation-state international behavior. Two schools of thought quickly developed. One looks to strengthened international law and international organizations to preserve peace; the other emphasizes that nations will always use their power to achieve goals and sees the key to peace in a balance of power among competing states. With increased importance attached to a theoretical understanding of the whole international system, there has been a growing use of concepts and modes of analysis developed in the natural sciences in an attempt to improve the verifiability and applicability of theories. In many of the leading U.S. universities there are both research institutes and schools of international relations. See diplomatic service ; United Nations ; European Union.

See R. Aron, Peace and War (tr. 1967); H. J. Morgenthau, Politics among Nations (5th ed. rev. 1978); F. S. Northedge and M. J. Grieve, A Hundred Years of International Relations (1971); R. W. Mansbach and J. A. Vasquez, In Search of Theory (1981); F. S. Pearson and J. M. Rochester, International Relations (2d ed. 1988).

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