League of Nations: An international organization established after World War I under the provisions of the Treaty of Versailles. The League, the forerunner of the United Nations, brought about much international cooperation on health, labor problems, refugee affairs, etc.
Treaty of Versailles: The treaty imposed on Germany by the Allied powers in 1920 after the end of World War I which demanded exorbitant reparations from the Germans.
Self-determination: A principle often seen as a moral and legal right whereby nations have an entitlement to sovereignty without external interference.