In what year was the League of Nations established?

The League of Nations was established in the aftermath of World War I, specifically in 1920, as a part of the Treaty of Versailles. Its primary aim was to promote peace and cooperation among countries to prevent future conflicts. While the founding documents were adopted in 1919, the League officially came into existence on January 10, 1920, marking it as a significant moment in international diplomacy and governance. Understanding this timeline is crucial, as it highlights the immediate post-war efforts to create a structured approach to international relations, which later influenced the formation of the United Nations after World War II. The other dates provided in the options do not correspond to the establishment of the League; 1945 is related to the founding of the United Nations, while 1939 marks the beginning of World War II, a period during which the League ultimately failed to maintain peace.