The original membership of the League included the victorious Allies of World War I (with the exception of the United States, whose Senate refused to ratify the Treaty of Versailles) and most of the neutral nations. Among later admissions to membership were Bulgaria (1920), Austria (1920), Hungary (1922), Germany (1926), Mexico (1931), Turkey (1932), and the USSR (1934). Through the efforts of Sir Eric Drummond, the first secretary-general of the League, a truly international secretariat was created. Geneva, Switzerland, was chosen as the League headquarters.
The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.