Theories and the reasons for war: a survey

War or conflict is an activity of aggression and violence with weapons and new technologies for resolving internal and/or international disputes between two or more nations, between organized ethnic, social and religious groups, etc., for the purpose of reducing the freedom of other societies/groups and causing social, economic, culturalor ethnic damages over time. The theories of the causes of wars can be distinguished in historical and modern theories. In general, a general theory of the causes of war is difficult to create because of manifold factors engaged in triggering conflicts over time and space. This study describes some theories that focus on specific factors generating a socioeconomic disequilibrium between nations and different populations that can lead to war.