Saba, Hanna Keywords: United Nations | Charter | Regionalism | Collective security | Mots clefs: Nations Unies | Charte | Régionalisme | Sécurité collective | ABSTRACT The danger of aggression by a powerful neighbor can create defense solidarity. In addition, there are also sociological solidarities, cultural solidarities, economic solidarities, as well as solidarities that exist due to the similarity of social and economic conditions. In this course, Hanna Saba first deals with the evolution of philosophical thought and…