New political realities emerged in the wake of the First World War (1914-1918), including deference to an international authority, rising above states and national political units, in order to resolve conflicts and postcolonial situations. The Algerian national movement sought to solicit international legitimacy as the best means of realizing independence, reclaiming authority, and achieving decolonization. Algeria was subject to French settler-colonialism, against which the country waged an armed popular resistance, then a revolutionary political and diplomatic struggle that began with the first registry of the issue with the United Nations in 1955. This study aims to confirm several considerations, including the role of international political authority in granting legitimacy to calls for independence, for reclaiming sovereignty and decolonization; the role of the Algerian issue in the United Nations and its contribution to establishing the principles of independence and decolonization; the importance of political and diplomatic resistance, as an extension of armed revolutionary conflict, and their effectiveness in the subsequent establishment of the modern state, in accordance with the demands of international common law as it applies to peoples, nations, and states; and solidifying the concept of safety and international security as grounds for the United Nations’ existence.