Purpose of the study: This study aims to discuss the American role in the anti-Soviet Afghan war and disclose the reasons for the Soviet worry about the growth of the fundamentalist terrorist groups inside Afghanistan. Methodology: This is library-based research work. Results: The article has come up with some main points on that severe war. One of these was that the American President Jimmy Carter's Doctrine in 1980. Carter's Doctrine could be considered a sort of policy that allows the use of military force in case American interests are exposed to Soviet threats. As a result, the American administration promised to militarily support the Afghan fighters against the Soviet control in Afghanistan. But, at the same time, the Americans failed to realize the ethnic, ideological, social, lingual, and theological structure of the Afghan society. Application: This study could have many applications in the faculties of politics and the contemporary altogether to teach the ways of public and secret or hidden political relationships between the secular states or so-called superpowers that employed the extremist groups to overwhelm the stable states that do not subdue to the western domination. Novelty: This study explores the incorrect claim of the superpowers in general and of the United States of America in particular of the theory of separation religion and the state, which is often used in the double standard.