Territory is one of the “major notions” of international law, arose from the need of states to distribute their competences on European and American continents between the 15th and 17th centuries. In certain time periods, the concept of “absolute competence” of the state over its territory underwent transformations. In this respect, the international community, through international organizations, in order to ensure international peace and security, the balance between the great powers and the countries which were only just starting to affirm their sovereignty, established international mechanisms for the administration of the territories. The scientific research that we have proposed to carry out will analyze the international mandate system and the international trusteeship system.