摘要
Many scientists and researchers in the field of international relations suggest theories which help to systematize our observations recognize stable patterns and explain those observations and paradigms. Furthermore, some scientists present recommendations about policies that should be selected. However, constantly in each issue of Foreign Policy, there are distinct and conflicting options for policy making. Theories of international relations are trying to find the causes and conditions that are sometimes direct countries to conflict, and sometimes to cooperate with each other. In this article, two important theoretical approaches in the field of international relations are considered which affect on the approaches of US leaders and decision making process in this country： Neo-Realism and Neo-Liberalism. The authors seek to show that what＇s the difference between these two approaches in theoretical principles？ Understanding of these differences will help to show this matter that based on suggestion of these two theories, how American policy makers must choose a rational choice from among competing alternatives？ Policymakers can select rational choices among competing alternatives, when a theory possesses empirical evidence, and values or goals.
