trusteeship system References trusteeship system UN Ask Anything Homework Help Written by The Information Architects of Encyclopaedia Britannica The Information Architects maintain a master list of the topics included in the corpus of Encyclopædia Britannica, and create and manage the relationships between them. The Information Architects of Encyclopaedia Britannica Britannica AI Ask Anything Learn about this topic in these articles: mandate…was replaced by the UN trusteeship system in 1946.…was replaced by the UN trusteeship system in 1946.United Nations/ History and development…new organization would include a trusteeship system to succeed the League of Nations mandate system.…new organization would include a trusteeship system to succeed the League of Nations mandate system.