The League of Nations met for the first time on January 16, 1920 in Paris, France. It was organized in the Paris Peace Conference, also known as the Treaty of Versailles, that ended the First World War. Its mission was to prevent wars by settling international disputes via negotiation. It also addressed such issues as labor conditions, human rights, arms trade and global health. The League lacked its own armed forces and depended on the Great Powers to enforce its resolutions and keep its economic sanctions. However the Great Powers were often reluctant to do so. After some notable successes and failures, the League proved incapable of preventing aggression by the Axis powers, all of whom withdrew from the League. The League lasted for 26 years and was replaced by the United Nations on April 20, 1946 after the Second World War.