Member states of the League of Nations - wikipedia Member states of the League of Nations For United Nations member states, see Member states of the United Nations. Between 1920 and 1939, a total of 63 countries became member states of the League of Nations. The Covenant forming the League of Nations was included in the Treaty of Versailles and came into force on 10 January 1920. The League of Nations was dissolved on 18 April 1946, when its assets and responsibilities were transferred to the United Nations. The League 's greatest extent was from 28 September 1934 ( when Ecuador joined ) to 23 February 1935 ( when Paraguay withdrew ) with 58 members. At this time, only Costa Rica ( 22 January 1925 ), Brazil ( 14 June 1926 ), Japan ( 27 March 1933 ) and Germany ( 19 September 1933 ) had withdrawn and only Egypt was left to join ( on 26 May 1937 ). The members ( listed from earliest joining and alphabetically if they joined on the same day ) at this time were Argentina, Australia, Belgium, Bolivia, the British Empire, Canada, Chile, China, Colombia, Cuba, Czechoslovakia, Denmark, El Salvador, France, Greece, Guatemala, Haiti, Honduras, India, Italy, Liberia, the Netherlands, New Zealand, Nicaragua, Norway, Panama, Paraguay, Persia / Iran, Peru, Poland, Portugal, Romania, Siam, South Africa, Spain, Sweden, Switzerland, Uruguay, Venezuela, Yugoslavia, Austria, Bulgaria, Finland, Luxembourg, Albania, Estonia, Latvia, Lithuania, Hungary, the Irish Free State, Ethiopia, the Dominican Republic, Mexico, Turkey, Iraq, the Soviet Union, Afghanistan, and Ecuador. Of the 42 founding members, 23 ( or 24, counting Free France ) remained members until the League of Nations was dissolved in 1946. A further 21 countries joined between 1920 and 1937, but 7 left, withdrew or were expelled before 1946. Countries are listed under the year in which they joined. The word `` withdrew '' indicates that a country left of its own choice. The word `` left '' indicates a country that ceased to exist because of annexation by Germany, Italy or the Soviet Union. The Soviet Union was the only country to be expelled by the League ( in 1939, following its invasion of Finland ). Despite formulating the concept and signing the Covenant, the United States never joined the League of Nations. Contents 1 Map 2 10 January 1920 : founding members 3 1920 4 1921 5 1922 6 1923 7 1924 8 1926 9 1931 10 1932 11 1934 12 1937 13 See also 14 Notes 15 External links Map A map of the world in the years 1920 -- 1945, which shows the League of Nations members during its history. Members Colonies of members Mandates Non-members Colonies of non-members 10 January 1920 : founding members Argentina ( withdrew 1921 on rejection of an Argentine resolution that all sovereign states would be admitted to the League. It resumed full membership 26 September 1933 ) Belgium Bolivia Brazil ( withdrew 14 June 1926 ) British Empire separate membership for : United Kingdom Australia Canada India New Zealand South Africa Chile ( withdrew 14 May 1938 ) China Colombia Cuba Czechoslovakia ( occupied by Germany 15 March 1939 ) Denmark El Salvador ( withdrew 11 August 1937 ) France ( Vichy France withdrew 18 April 1941 ; withdrawal not recognised by Free French forces ) Greece Guatemala ( withdrew 26 May 1936 ) Haiti ( withdrew April 1942 ) Honduras ( withdrew 10 July 1936 ) Italy ( withdrew 11 December 1937 ) Japan ( withdrew 27 March 1933 ) Liberia Netherlands Nicaragua ( withdrew 27 June 1936 ) Norway Panama Paraguay ( withdrew 23 February 1935 ) Persia ( known as Iran from 1934 ) Peru ( withdrew 8 April 1939 ) Poland Portugal Romania ( withdrew July 1940 ) Siam ( known as Thailand from 1939 ) Spain ( withdrew May 1939 ) Sweden Switzerland Uruguay Venezuela ( withdrew 12 July 1938 ) Yugoslavia ( known as Kingdom of Serbs, Croats and Slovenes until 1929 ) 1920 Austria ( joined 15 December 1920 ; occupied and annexed by Germany 13 March 1938 ) Bulgaria ( joined 16 December 1920 ) Costa Rica ( joined 16 December 1920 ; withdrew 22 January 1925 ) Finland ( joined 16 December 1920 ) Luxembourg ( joined 16 December 1920 ) Albania ( joined 17 December 1920 ) 1921 Estonia ( joined 22 September 1921 ; occupied and annexed by the Soviet Union in 1940 ) Latvia ( joined 22 September 1921 ; occupied and annexed by the Soviet Union in 1940 ) Lithuania ( joined 22 September 1921 ; occupied and annexed by the Soviet Union in 1940 ) 1922 Hungary ( joined 18 September 1922 ; withdrew 11 April 1939 ) 1923 Irish Free State ( joined 10 September 1923, known as Ireland from 1937 ) Abyssinia ( joined 28 September 1923 ) 1924 Dominican Republic ( joined 28 September 1924 ) 1926 Germany ( joined 8 September 1926 ; withdrew 19 October 1933 ) 1931 Mexico ( joined 9 September 1931, and is declared member 12 September 1931 ) 1932 Turkey ( joined 18 July 1932 ) Iraq ( joined 3 October 1932 ) 1934 Soviet Union ( joined 18 September 1934 ; expelled 14 December 1939 ) Afghanistan ( joined 27 September 1934 ) Ecuador ( joined 28 September 1934 ) 1937 Egypt ( joined 26 May 1937 ) See also United Nations portal Member states of the United Nations Notes Jump up ^ South America Archived 10 May 2008 at the Wayback Machine., Encyclopedia of World History Jump up ^ League of Nations chronology, United Nations Jump up ^ Members of the 1st Assembly, League of Nations, Geneva, November 15 to December 18, 1920. Jump up ^ Czechoslovakia never formally left the League and was present at the last meeting of the Assembly in 1946 Jump up ^ Left upon German takeover in 1943 Jump up ^ Occupied by Axis Powers 1941 -- 1945 Jump up ^ Withdrew from active participation in the League after its defeat by the Soviet Union in 1944. Jump up ^ Forced to withdraw by German occupation in May 1940 and incorporation into the German Reich. Jump up ^ Forced to withdraw by Italian invasion of 1939. Jump up ^ Toledo - García, Itzel ; University of Essex, UK : ' ' `` La cuestión de la dignidad nacional en el ingreso de México a la Sociedad de Naciones, 1919 - 1931 '' ' ' ( 1 ) Retrieved September 4, 2016. ( Translated from Spanish : `` On September 7th, 1931, the British Empire, Germany, Northern Ireland, Spain, France, Italy and Japan began the initiative ; next day the proposal was adopted unanimously by the assembly, and the invitation was sent to the government of Mexico. The 10th of September the acceptance was communicated in Geneva... Two days later, Mexico was declared member of the League of Nations. '' ) External links Map of League of Nations members worldstatesmen.org List of States Members of the League of Nations on 31. XII. 1944 from the League of Nations Statistical Yearbook ( 1942 - 44 ) Paris Peace Conference, 1919 League of Nations Covenant of the League of Nations Members Organisation Minority Treaties Little Treaty of Versailles Mandates Treaty of Versailles War guilt Reparations Role in the Weimar Republic 's hyperinflation Dawes Plan Young Plan Lausanne Conference Locarno Stresa Front Possible cause of the Second World War International Opium Convention Subsequent treaties Treaty of Saint - Germain - en - Laye Treaty of Neuilly - sur - Seine Treaty of Trianon Treaty of Sèvres Partition of the Ottoman Empire Conference of London ( 1920 ) San Remo conference Turkish National Movement Turkish War of Independence Treaty of Lausanne Other American Commission to Negotiate Peace Commission of Responsibilities The Inquiry Related A Peace Conference at the Quai d'Orsay The Signing of Peace in the Hall of Mirrors To the Unknown British Soldier in France Retrieved from `` https://en.wikipedia.org/w/index.php?title=Member_states_of_the_League_of_Nations&oldid=841512995 '' Categories : League of Nations Countries by international organization League of Nations - related lists Hidden categories : Webarchive template wayback links All articles with unsourced statements Articles with unsourced statements from July 2017 Use dmy dates from March 2017 Talk Contents About Wikipedia Español Euskara فارسی Français 한국어 Bahasa Indonesia Bahasa Melayu 日本 語 Română Русский Suomi 中文 5 more Edit links This page was last edited on 16 May 2018, at 09 : 08. 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Question: what country did not join the league of nations
Answer: the United States