The results of the demographic studies and research has progressively been used by planners and policy makers during the last half a century. While the scientific studies of population played an effective role in formulation of national and international policies, the question raises that what has been the impact of the international political changes and development programs on the scientific identity of demography? This article attempts to discuss, with a wholistic approach, the impact of the global social, economic and political changes on the wisdom of demography. After an overview of the history of the development of population sciences in the last few centuries, an attempt is made to elaborate on the consequences of recent development programs and international political events, such as world wars, diffusion of communism, cold war and social movements supporting women's rights and birth control on shaping the population issues and studies. This article, also, emphasizes on the necessity of attention to the impact of general atmosphere and international political events on the orientation, interpretation and application of demographic studies and research and the importance of demographers commitment to maintain the scientific spirit and principles of their field of study.