Theory of constructivism has also gained popularity in recent times in international relations. Further, institutionalism, Marxism, functionalism and feminism are inconsistent ways of thinking, playing major role in international relations’ comprehension. These theories are helpful in making international relations a conceptual domain to understand nature of contacts among nations. They also help shape foreign policies and plan economic interaction and make defence and military strategies coupled with their successful execution and management. One of the dominant theories of international relations since the inception of this discipline is theory of realism. Early writers such as Thucydides, Machiavelli and Rousseau are said to be among the supporters of this theory (Jackson 2005 p7). Realists believe that nation states are the main actors in international politics (Snyder 2004 p59). These scholars assume that nation-states, particularly sovereign ones, being unitary in form and geographically based are the main characters of the international system having no central authority to govern them. As a result, in the absence of a central governing body, there prevails a state of disorder and ushers power struggle among nations in pursuance of their national interests. . Main Theories and Applications of International Relations.
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