In spite of the increasing number of internal and international actors, the state has always played a crucial and central role in the international arena. This has resulted in the establishment of an international system in five historical periods. In all these periods, the needs of the international actors have been the determining factors of policies and activities in each period. For this purpose, the practice of peace and cooperation for any other purpose requires power. Without employing power, the path towards peace and cooperation will be restricted. The author tests the hypothesis that the good intentions and humanitarian structures of decision making are not adequate in the international system and in order to achieve the democratic and sacred ideals of cooperation, we need the accumulation of power. In this same area, the fall of great powers, the theoretical issues in international interactions, and the punishment and persuasion options will be taken under consideration.