# Member states of the League of Nations

Between 1920 and 1946, a total of 63 countries became member states of the League of Nations.
When the Assembly of the League of Nations first met, it consisted of 42 founding members. A further 21 countries joined between then and the dissolution of the League.
As several countries withdrew from the League during the course of its existence, the 63 countries were never all members at the same time. The League's greatest extent was from 28 September 1934 (when Ecuador joined) to February 1935 (when Paraguay withdrew) with 58 countries. At this time, only Costa Rica (December 1924), Brazil (June 1926), Japan (March 1933), and Germany (October 1933) had withdrawn, and only Egypt joined later (on 26 May 1937).

## Founding members

The Covenant of the League of Nations was part of the Treaty of Versailles, signed on 28 June 1919 between the Allies of World War I and Germany. In order for the treaty to enter into force, it had to be deposited at Paris; in order to be deposited, it had to be ratified by Germany and any three of the five Principal Powers (the United States of America, the British Empire, France, Italy, and the Empire of Japan). Any Allied signatory that ratified the treaty would automatically join the League.
Germany was forced to ratify the treaty first, which it did on 10 July 1919. Italy ratified on 7 October 1919, the British Empire and its colonies ratified on 10 October 1919, and France ratified on 12 October 1919. These ratifications were deposited (along with those of ten other countries) on 10 January 1920. All but three of the remaining signatories (the United States, Ecuador, and the Kingdom of Hejaz) had ratified by the time the Assembly first met on 15 November 1920.
The Covenant also invited 13 neutral nations to join the League. To join, an invitee had to agree ("accede without reservation") to the Covenant within two months of the League's founding. All 13 invitees accepted their invitations within the two-month deadline; four of them accepted their invitations even before the League was founded.
The United States Senate voted 49–35 in favor of ratification, but this failed to reach the necessary two-thirds majority. Hejaz (later Saudi Arabia) also never ratified the treaty. Ecuador would not ratify the treaty until 1934. As an original Allied signatory, Ecuador was entitled to join the League this way with no deadline or Assembly vote, and the League considered Ecuador to still be a founding member.
Uniquely, China (then the Beiyang government) joined the League by ratifying the Treaty of St. Germain (with Austria) instead of the Treaty of Versailles (with Germany), as both treaties included the Covenant of the League of Nations. It had refused to sign the Treaty of Versailles due to it giving the previously-German-controlled Shandong colony in China to the Empire of Japan.
Additional members could join the League by a two-thirds vote of the Assembly.

## List

Founding members below are listed in the order matching the Covenant (signatories first, followed by invitees), except for Ecuador. The colonies of the British Empire immediately followed it and did not sign in alphabetical order. Czechoslovakia and El Salvador were alphabetized under 'S'.
A country was allowed to send a withdrawal notice at any time, but it would take two years to come into effect after the League received it, and meanwhile the country would retain both its obligations and its membership. In practice, a withdrawing country quit the League immediately, and was absent from all sessions and votes for the last two years of its formal membership. The "Date of withdrawal" column shows when the withdrawal notice was sent.
Original Allied signatory  Original invitee
List of members :
| Member state | Date of admission | Date of withdrawal | Notes |
| Belgium | 10 January 1920 | | |
| Bolivia | 10 January 1920 | | |
| Brazil | 10 January 1920 | 12 June 1926 | Withdrew upon rejection of a resolution to give Brazil the United States' vacant permanent Council seat. |
| British Empire | 10 January 1920 | | All six members joined from one ratification document. |
| Canada | 10 January 1920 | | All six members joined from one ratification document. |
| Australia | 10 January 1920 | | All six members joined from one ratification document. |
| South Africa | 10 January 1920 | | All six members joined from one ratification document. |
| New Zealand | 10 January 1920 | | All six members joined from one ratification document. |
| India | 10 January 1920 | | All six members joined from one ratification document. |
| China | 16 July 1920 | | |
| Cuba | 8 March 1920 | | |
| France Free France (1943-44) | 10 January 1920 | | Vichy France sent a notice of withdrawal 19 April 1941, which the League recognized. Free France did not recognize Vichy France's withdrawal and rescinded the notice 15 and 16 April 1943, which the League also recognized. |
| Greece | 30 March 1920 | | |
| Guatemala | 10 January 1920 | 14 May 1936 | Withdrawal notice received by the League 26 May 1936. |
| Haiti | 30 June 1920 | 16 February 1942 | Withdrawal notice received by the League 8 April 1942. |
| Honduras | 3 November 1920 | 22 June 1936 | Withdrawal notice received by the League 10 July 1936. |
| Italy | 10 January 1920 | 11 December 1937 | Quit after the League sanctioned it for invading Ethiopia. |
| Empire of Japan | 10 January 1920 | 25 March 1933 | Quit after the League refused to recognize the puppet state of Manchukuo. |
| Liberia | 30 June 1920 | | |
| Nicaragua | 3 November 1920 | 26 June 1936 | |
| Panama | 25 November 1920 | | |
| Peru | 10 January 1920 | 4 April 1939 | |
| Poland | 10 January 1920 | | |
| Portugal | 8 April 1920 | | |
| Romania | 14 September 1920 | 10 July 1940 | |
| Kingdom of Serbs, Croats, and Slovenes | 10 February 1920 | | Renamed Yugoslavia in 1929. |
| Siam | 10 January 1920 | | Renamed Thailand in 1939. |
| Czechoslovakia | 10 January 1920 | | Occupied and annexed by Nazi Germany 15 March 1939; never withdrew. |
| Uruguay | 10 January 1920 | | |
| Argentina | 10 January 1920 | | Invitee; accepted 18 July 1919. Quit 4 December 1920 without sending a notice of withdrawal; resumed participation 26 September 1933. |
| Chile | 10 January 1920 | 31 May 1938 | Invitee; accepted 4 November 1919. |
| Colombia | 16 February 1920 | | Invitee. |
| Denmark | 8 March 1920 | | Invitee. Occupied by Nazi Germany 9 April 1940 and forced to withdraw 19 July 1940; withdrawal not recognized by the League. Withdrawal notice rescinded in 1945. |
| Netherlands | 9 March 1920 | | Invitee. |
| Norway | 9 March 1920 | | Invitee. |
| Paraguay | 10 January 1920 | 23 February 1935 | Invitee; accepted 29 October 1919. Quit during the Chaco War after rejecting the League's arbitration. |
| Persia | 10 January 1920 | | Invitee; accepted 21 November 1919. Renamed Iran in 1935. |
| El Salvador | 10 March 1920 | 26 July 1937 | Invitee. Withdrawal notice received by the League 10 August 1938. |
| / Spain/Second Spanish Republic | 10 January 1920 | 8 May 1939 | Invitee. Withdrew 8 September 1926 with the formal 2-year notice; rejoined 22 March 1928 before the 2 years were up. Quit after Francisco Franco came to power. |
| Sweden | 9 March 1920 | | Invitee. |
| Switzerland | 8 March 1920 | | Invitee. |
| Venezuela | 3 March 1920 | 11 July 1938 | Invitee. |
| Austria | 15 December 1920 | 18 March 1938 | The League recognized the Anschluss (five days afterward) and removed Austria from its list of members. |
| Bulgaria | 16 December 1920 | | |
| Costa Rica | 16 December 1920 | 24 December 1924 | Gave slightly more than two years' notice, with its membership formally ceasing 1 January 1927. |
| Finland | 16 December 1920 | | |
| Luxembourg | 16 December 1920 | | |
| Albania | 17 December 1920 | | Occupied by Italy 12 April 1939; the puppet government sent a notice of withdrawal to the League 13 April 1939, but the League did not recognize the puppet government or accept the notice. |
| Estonia | 22 September 1921 | | Occupied by the Soviet Union and annexed 6 August 1940; never withdrew. |
| Latvia | 22 September 1921 | | Occupied by the Soviet Union and annexed 5 August 1940; never withdrew. |
| Lithuania | 22 September 1921 | | Occupied by the Soviet Union and annexed 3 August 1940; never withdrew. |
| Hungary | 18 September 1922 | 11 April 1939 | |
| Irish Free State | 10 September 1923 | | Renamed Ireland in 1937. |
| Abyssinia | 28 September 1923 | | The League switched from using "Abyssinia" to "Ethiopia" between September 1934 and September 1935. Occupied by the Italian Empire and annexed from 9 May 1936 to 5 May 1941; never withdrew. |
| Dominican Republic | 29 September 1924 | | |
| Germany | 8 September 1926 | 19 October 1933 | Quit after Hitler came to power. |
| Mexico | 12 September 1931 | | The League invited Mexico to join on 8 September 1931. |
| Turkey | 18 July 1932 | | |
| Iraq | 3 October 1932 | | |
| Soviet Union | 18 September 1934 | 14 December 1939 | § Expulsion of the Soviet Union |
| Afghanistan | 27 September 1934 | | |
| Ecuador | 28 September 1934 | | |
| Egypt | 26 May 1937 | | |

## Expulsion of the Soviet Union

On 14 December 1939, the Soviet Union was expelled for invading Finland in violation of the Covenant of the League of Nations, by a Council vote of 7–0–4–3 (7 in favor, 0 against, 4 abstaining, 3 absent). The United Kingdom, France, Belgium, Bolivia, the Dominican Republic, South Africa, and Egypt voted in favor; the Republic of China, Finland, Greece, and Yugoslavia abstained; and Iran, Peru, and the Soviet Union itself were absent. Three of the votes in favor had been made Council members the day before the vote (South Africa, Bolivia, and Egypt). This was one of the League's final acts before it practically ceased to function.
It has been disputed whether the expulsion was legally valid. Article 16 paragraph 4 of the Covenant stated that the Council may expel a member from the League if all members of the Council other than the to-be-expelled member concur. However, it is unclear if abstentions or absences were permitted for expulsion votes (though it is undisputed that they were allowed for non-expulsion unanimous Council decisions). Even if permitted, it is disputed whether the expulsion could be legally valid without a majority (8 out of 14) of the Council in favor.
Regardless, both the expulsion and dispute had little practical effect. The Soviet Union had already declared nine days earlier that it would be absent from the League until further notice; it acknowledged its expulsion and made no move to challenge it on the disputed grounds. No other member was ever expelled from the League to demonstrate any precedent, and the League took no further significant actions due to the Second World War.

## Non-members

Between November and December 1920, Armenia, Azerbaijan, Georgia, and Ukraine applied for membership amid the dissolution of the Russian Empire and the Russian Civil War, but were denied because they did "not appear to have a stable government whose authority extends over the whole of its territory". (Some extra consideration was given to Armenia due to it being a signatory of the Treaty of Sèvres, which would have given Armenia some territory from the broken-up Ottoman Empire, but the treaty failed to be ratified.) Estonia, Latvia, and Lithuania also applied in 1920 and were denied that year because they "had not achieved a definite international status" at the time (the three would be admitted the next year).
Some of the European microstates, namely Liechtenstein, Monaco, and San Marino, also applied for membership but were denied, explicitly due to their "small size". Andorra and Vatican City never sought membership.
Iceland was given the opportunity to join the League of Nations in 1920, but opted not to, primarily due to limited administrative resources.
Some relatively-isolated sovereign states in Asia also did not join, including Bhutan, Nepal, and Yemen, at least in part due to having no diplomatic relations with the major powers. Tibet and Mongolia were de facto independent, but their independence was not recognized by the major powers.
At the IX Congress of European Nationalities, an organization of the League of Nations, held in Bern, the first three autonomous jurisdictions of Spain (Basque Country, Galicia, and Catalonia), were recognized as nations, but since they were not constitutionally independent, they were represented by the Spanish government.

## World War II and aftermath

Several member states were occupied or annexed during World War II, during which the League was largely paralyzed and held no sessions or votes. With the exception of the Anschluss, the League did not recognize any of these occupations, and the occupied states remained members of the League on paper. With the exception of Vichy France (later rescinded by Free France), the League also did not recognize any notices of withdrawal sent by puppet regimes, considering them to have been sent under duress. Not all puppet regimes attempted to withdraw.
The membership table above notes occupations that began before the start of World War II in Europe, those that continued after the end of World War II, and those whose puppet states attempted to withdraw. For brevity, the large number of occupations that do not meet these criteria (such as in the case of Luxembourg) are not listed.
The 20th annual session of the Assembly took place in 1939, but the 21st session did not take place until April 1946, after which the League ceased to exist. During this last session, 35 out of 44 League members attended, with Albania, Bulgaria, Ethiopia, Iraq, Liberia, Thailand, and the Baltic states not present. (Colombia was present, but only as a non-voting observer as its government had not authorized its representative on whether to vote for or against the dissolution of the League. Allied-occupied Austria was also permitted to send an observer with approval from its occupiers and the rest of the League.)
The League partially did not recognize the Soviet occupation of the Baltic states, which were the only member states of the League to remain occupied after the end of World War II. In its last session, Estonia, Latvia, and Lithuania remained on the list of members of the League. However, two months before the session, the League stated that it would not consider the 1939 documents of any representatives as valid, and required the governments of the League members to furnish new documents naming representatives. When the representatives of the Latvian government-in-exile and Lithuanian government-in-exile attempted to attend the session, a Secretariat staff member denied their 1939 documents as instructed, and explicitly stated that there did not exist any government which could provide them with the necessary credentials. The letter documenting this incident refers to the representatives as the "permanent delegate of Latvia" and "permanent delegate of Lithuania" as titles. (The letter does not mention the presence of the delegate of Estonia.) The staff member offered the representatives, and their family members and assistants, entry into the League's diplomatic gallery to spectate the session, but the representatives refused the offer for themselves, while accepting it for their family members and assistants. In addition, the offered entry card, and even the envelope containing the card, explicitly omitted a country name and a title.
The League of Nations was formally dissolved on 18 April 1946; its assets and responsibilities were transferred to the United Nations.