| Letter | Meaning |
|---|---|
| D | Nation was disestablished this year |
| E | Nation was established this year |
| P | Nation was a protectorate |
| V | Nation was a vassal or puppet state |
A
- Aden Protectorate (P)
Alawi Sheikhdom
Aqrabi Sheikhdom- Audhali Sultanate
Emirate of Beihan
Dathina Sheikhdom
Emirate of Dhala
Fadhli Sultanate
Hawshabi Sultanate of Musaymir
Hadhrami Kathiri Dynasty in Seiyun
Sultanate of Lahej
Lower Aulaqi Sultanate
Sultanate of Lower Yafa
Mahra State of Qishn and Socotra- Sheikhdom of Shaib
Qu'aiti State of Shihr and Mukalla- Subeihi Sultanate
- Upper Aulaqi Sheikhdom
State of Upper Yafa
Wahidi Sultanate of Balhaf in Hadhramaut- Wahidi Sultanate of Bir ‘Ali
- Wahidi Sultanate of Habban in Hadhramaut
Emirate of Afghanistan (P)
Alash Autonomy
Principality of Albania
Alsace-Lorraine Soviet Republic (E) (D)- Confederated Republic of Altai (E)
- Amur Socialist Soviet Republic (E) (D)
Principality of Andorra
Argentine Republic
Republic of Armenia (E)
Idrisid Emirate of Asir
Sultanate of Aussa
Commonwealth of Australia
Austro-Hungarian Monarchy (D)
Provisional Government of Autonomous Siberia (E) (D)
> 
Azerbaijan Democratic Republic (E) (V)
B
Free People's Republic of Baden (E)
Bahrain and Its Dependencies (P)
Baku Soviet Commune- Banat Republic (E) (V)
Kingdom of Barotseland (P)- People's State of Bavaria (E)
Belarusian Democratic Republic
Kingdom of Belgium- Kingdom of Bhutan (P)
- Black Sea Soviet Republic (E) (D)
History of Bolivia (1809–1920)
Republic of the United States of Brazil
State of Brunei, the Abode of Peace (P)
Emirate of Bukhara (P)
Tsardom of Bulgaria- State of Buryat-Mongolia
C
Kingdom of Cambodia (P)
Dominion of Canada
Centrocaspian Dictatorship (E) (D)
Republic of Chile
Republic of China
Republic of Colombia
Republic of Costa Rica- Committee of Members of the Constituent Assembly (E) (D)
- Duchy of Courland and Semigallia (E) (D) (V)
Crimean People's Republic (D)
Crimean Regional Government (E)
Republic of Cuba
D
E
F
> 
Kingdom of Finland (E) (V)- Finnish Socialist Workers' Republic (E) (D)
French Republic
G
Democratic Republic of Georgia (P)
Republic of German-Austria (E)
German Realm (D)
Duchy of Anhalt- Grand Duchy of Baden
Kingdom of Bavaria
Free Hanseatic City of Bremen
Duchy of Brunswick
Free and Hanseatic City of Hamburg
Grand Duchy of Hesse and by Rhine
Principality of Lippe
Free and Hanseatic City of Lübeck
Grand Duchy of Mecklenburg-Schwerin- Grand Duchy of Mecklenburg-Strelitz
Grand Duchy of Oldenburg
Kingdom of Prussia
Principality of Reuss Elder Line
Principality of Reuss Junior Line
Duchy of Saxe-Altenburg
Duchy of Saxe-Coburg and Gotha
Duchy of Saxe-Meiningen
Grand Duchy of Saxony
Kingdom of Saxony
Principality of Schaumburg-Lippe
Principality of Schwarzburg-Rudolstadt
Principality of Schwarzburg-Sondershausen
Principality of Waldeck and Pyrmont
Kingdom of Württemberg
- German Realm (E)
Grand Duchy of Luxembourg
Great Southern Kingdom
Kingdom of Greece
Green Ukraine (E)
Republic of Guatemala
H
I
J
K
Kedah Sultanate (P)
Sultanate of Kelantan (P)
Khanate of Khiva (P)
Komańcza Republic (E)
Kuban People's Republic (E)
L
Kingdom of Luang Prabang (P)
Executive Committee of the Soviet of Workers, Soldiers, and the Landless in Latvia (D)
Latvian Provisional Government (E)
Latvian Socialist Soviet Republic (E)
Republic of Liberia
Principality of Liechtenstein
Kingdom of Lithuania (E) (D) (V)- Republic of Lithuania (E)
Lithuanian Soviet Socialist Republic (E) (V)
M
- Mainz Workers' and Soldiers' Council (E) (D)
- Makhnovshchina
Federated Malay States (P)
United Mexican States
Moldavian Democratic Republic (D)
Principality of Monaco
Great Mongolian State
Kingdom of Montenegro (D)
Sultanate of Morocco (P)
Mountainous Republic of the Northern Caucasus
Provisional Military Dictatorship of Mughan (E)
Sultanate of Muscat and Oman (P)
N
O
- Odessa Soviet Republic (E) (D)
- Provisional Government of Olonets (E)
- Republic of Ostrów (E) (D)
P
Q
State of Qatar (P)
R
Kingdom of Romania- Russian Democratic Federative Republic (D)
Russian Soviet Republic (E) (D)
Russian Socialist Federative Soviet Republic (E)- Don Soviet Republic (E) (D)
- Kuban Soviet Republic (E) (D)
- Kuban-Black Sea Soviet Republic (E) (D)
- North Caucasian Soviet Republic (E)
- Stavropol Soviet Republic (E) (D)
- Taurida Soviet Socialist Republic (E) (D)
- Terek Soviet Republic (E)
- Turkestan Soviet Federative Republic (E)
Ukrainian People's Republic of Soviets (D)
- Russian State (E)
S
Republic of San Marino
Raj of Sarawak (P)
Kingdom of Serbia (D)
Kingdom of Serbs, Croats and Slovenes (E)
Sheikhdom of Kuwait (P)
Kingdom of Siam- Provisional Siberian Government (E) (D)
Siberian Republic (E) (D)
Union of South Africa
Kingdom of Spain
State of Slovenes, Croats and Serbs (E) (D)
Sublime Ottoman State
Swaziland Protectorate (P)
Kingdom of Sweden
Swiss Confederation
T
- Republic of Tarnobrzeg (E) (D)
Sultanate of Terengganu (P)
Tibet
Kingdom of Tonga (P)- Transcaspian Government (E)
Transcaucasian Democratic Federative Republic (E) (D)- Tripolitanian Republic (E)
- Trucial States (P)
Regency of Tunis (P)
Turkestan Autonomy (D)
U
- Ukrainian People's Republic (D) (E)
- Ukrainian Soviet Republic (E)
- Ukrainian State (E) (D) (V)
United Baltic Duchy (E) (D) (V)- United Kingdom of Great Britain and Ireland
United States of America
Sheikdom of Upper Asir
Provisional Regional Government of the Urals (E) (D)
Oriental Republic of Uruguay
Uryankhay Krai (P)
V
W
Y
Z
- Republic of Zakopane (E) (D)
Sultanate of Zanzibar (P)
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