The major global event that led to the establishment of the United Nations (UN) was World War II. In the aftermath of the war, nations sought a way to prevent future conflicts and promote international cooperation. The UN was founded in 1945, aiming to foster peace and security through dialogue and collective action. Its creation marked a paradigm shift in international relations, moving from unilateral actions to a multilateral approach to addressing global issues. The UN established key principles such as sovereign equality of nations and the promotion of human rights, shaping global governance and diplomacy.