The primary factor leading to the establishment of the United Nations (UN) was the desire to prevent another global conflict after the catastrophic events of World War II. The UN was formed in 1945, following the failure of the League of Nations to maintain peace and prevent war. Nations recognized the need for a new organization that would promote international cooperation, peace, and security. The UN aimed to foster dialogue among countries, provide a platform for conflict resolution, and address issues such as human rights and humanitarian aid. Its creation was a pivotal step toward establishing a rules-based international order.