Countries

Europe

United Kingdom
- United Kingdom of Great Britain and Ireland (1900-1922)
- British Empire (1900-1997)
- United Kingdom of Great Britain and Northern Ireland (1922-)
- Commonwealth Realm (1931-)
- British Overseas Territories (1997-)
- England
  - England (1900-)
- Scotland
  - Scotland (1900-)
- Wales
  - Wales (1900-1953)
  - Wales (1953-1959)
  - Wales (1959-)
- Northern Ireland
  - Northern Ireland (1921-1953)
  - Northern Ireland (1953-)
- Isle of Man
  - Isle of Man (1900-1932)
  - Isle of Man (1932-)
- Channel Islands
  - German occupation of the Channel Islands (1940-1945)
  - Jersey
    - Bailiwick of Jersey (1900-1940) (1945-1981)
    - Bailiwick of Jersey (1981-)
  - Guernsey
    - Bailiwick of Guernsey (1900-1936)
    - Bailiwick of Guernsey (1936-1940) (1945-1985)
    - Bailiwick of Guernsey (1985-)
France
- French Third Republic (1900-1940)
- French Colonial Empire (1900-1958)
- German occupation of north-east France (1914-1918)
- German Military Administration in France (1940-1944)
- Italian Military Administration in France (1940-1943)
- Free France (1940-1944)
- French State (1940-1944)
- Italian occupation of Corsica (1942-1943)
- French Committee of National Liberation (1943-1944)
- Provisional Government of the French Republic (1944-1946)
- French Fourth Republic (1946-1958)
- French Union (1946-1958)
- French Community (1958-1995)
- French Fifth Republic (1958-)
- French Colonial Empire (1958-1980)
- Overseas France (1980-)
Germany
- German Empire (1900-1918)
- German Colonial Empire (1900-1918)
- Free Socialist Republic of Germany (1918-1919)
- Saxon Soviet Republic (1918-1919)
- Entente occupation of the Rhineland (1918-1919)
- Weimar Republic (1918-1919)
- Bavarian Soviet Republic (1919)
- Bremen Soviet Republic (1919)
- League of Nations occupation of the Rhineland (1919-1930)
  - Free State of Bottleneck (1919-1923)
  - French occupation of Frankfurt (1920)
  - Franco-Belgian occupation of the Ruhr (1923-1925)
- Weimar Republic (1919-1933)
- Territory of the Saar Basin (1920-1935)
- Free City of Danzig (1920-1939)
- Rhenish Republic (1923-1924)
- German Reich (1933-1935)
- German Reich (1935-1943)
- Greater German Reich (1943-1945)
- Allied-occupied Germany (1945-1949)
  - American occupation zone of Germany (1945-1947)
  - British occupation zone of Germany (1945-1947)
  - French occupation zone of Germany (1945-1948)
  - Soviet occupation zone of Germany (1945-1949)
  - Bizone (1947-1948)
  - Trizone (1948-1949)
- Saar Protectorate (French Protectorate) (1947-1956)
- Federal Republic of Germany (1949-)
- German Democratic Republic (Soviet Satellite) (1949-1959)
- East German Uprising (1953)
- German Democratic Republic (Soviet Satellite) (1959-1990)
- Peaceful Revolution (1989-1990)
Italy
- Kingdom of Italy (1900-1946)
- Italian Colonial Empire (1900-1946)
- Italian Social Republic (German Puppet) (1943-1945)
- Italian Republic (1946-2003)
- Italian Colonial Empire (1946-1960)
- Free Territory of Trieste (1947-1954)
- Italian Republic (2003-2006)
- Italian Republic (2006-)
Belgium
- Kingdom of Belgium (1900-1940) (1944-)
- Belgian Colonial Empire (1908-1962)
- German occupation of Belgium (1914-1918)
- First de Broqueville government (1914-1916)
- Second de Broqueville government (1916-1918)
- Belgian government in London (1940-1944)
- Military Administration of Belgium and Northern France (1940-1944)
- Belgian Resistance (1940-1944)
- Reichskommissariat of Belgium and Northern France (1944)
Netherlands
- The Netherlands (1900-1940) (1945-)
- Kingdom of the Netherlands (1900-)
- Dutch Colonial Empire (1900-1975)
- Dutch government-in-exile (1940-1945)
- Reich Commissariat for the Occupied Dutch Territories (1940-1945)
- Dutch Resistance (1941-1945)
Luxembourg
- Grand Duchy of Luxembourg (1900-1914) (1918-1940) (1944-)
- Eyschen Government (1914-1918)
- German occupation of Luxembourg (1914-1918)
- Luxembourg government in exile (1940-1944)
- Military Administration of Luxembourg (1940)
- Civil Administration Area of Luxembourg (1940-1942)
- Luxembourgish Red Lion (1941-1944)
Russia
- Russian Federation (1991-1993)
- Russian Federation (1993-)
- White Russia
  - Russian Empire (1900-1917)
  - Russian Republic (1917)
  - White Movement (1917-1923)
  - Russian Democratic Federative Republic (1917-1918)
  - Provisional All-Russian Government (1918-1920)
  - Eastern Okraina (1920)
- Red Russia
  - Russian Soviet Republic (1917-1818)
  - Russian Soviet Republic (1918-1922)
  - Russian Socialist Federative Soviet Republic (1922-1937)
  - Russian Soviet Federative Socialist Republic (1937-1954)
  - Russian Soviet Federative Socialist Republic (1954-1991)
  - Russian Soviet Federative Socialist Republic (1991)
Poland
- Kingdom of Poland (German Puppet) (1917-1918)
- Republic of Zakopane (1918)
- Republic of Tarnobrzeg (1918-1919)
- Galician Soviet Socialist Republic (1920)
- Second Polish Republic (1918-1939)
- Military Administration in Poland (1939)
- General Government (1939-1945)
- Polish Underground State (1939-1945)
- Government of the Republic of Poland in exile (1939-1990)
- Provisional Government of the Republic of Poland (1944-1945)
- Provisional Government of National Unity (Soviet Satellite) (1945-1947)
- Polish People's Republic (Soviet Satellite) (1947-1989)
- Republic of Poland (1989-)
Denmark
- Kingdom of Denmark (1900-1940) (1945-)
- Danish Colonial Empire (1900-1940) (1945-1953)
- Danish Freedom Council (1940-1945)
- Protectorate of Denmark (German Protectorate) (1940-1943)
- Danish Resistance Movement (1940-1945)
- German occupation of Denmark (1943-1945)
- The Unity of the Realm (1948-)
Norway
- Kingdom of Norway (1905-1940) (1945-)
- Norwegian Overseas Territories (1905-)
- Nygaardsvold's Cabinet (1940-1945)
- Reichskommissariat Norwegen (1940-1945)
- Norwegian Resistance Movement (1940-1945)
- National Government (German Puppet) (1942-1945)
Spain
- Kingdom of Spain (1900-1931)
- Second Spanish Republic (1931-1939)
- Spanish State (1936-1938)
- Spanish State (1938-1945)
- Government of the Spanish Republic in exile (1939-1977)
- Spanish State (1945-1947)
- Kingdom of Spain (1947-1977)
- Kingdom of Spain (1977-1981)
- Kingdom of Spain (1981-)
Turkey
- Ottoman Empire (1900-1923)
- Turkish National Movement (1919-1923)
- Government of the Grand National Assembly (1920-1923)
- Republic of Turkey (1923-)
Serbia
- Kingdom of Serbia (1900-1918)
- Territory of the Military Commander in Serbia (1941-1944)
- Government of National Salvation (German Puppet) (1941-1944)
- Federal State of Serbia (1945-1946)
- People's Republic of Serbia (1946-1963)
- Socialist Republic of Serbia (1963-1990)
- Republic of Serbia (1990-1992)
- Republic of Serbia (1992-2006)
- Republic of Serbia (2006-2010)
- Republic of Serbia (2010-)
Vatican City
- States of the Church (Italian Province) (1900-1929)
- Vatican City State (1929-)
- Holy See (1929-)
San Marino
- Most Serene Republic of San Marino (1900-1944) (1944-2011)
- German occupation of San Marino (1944)
- British occupation of San Marino (1944)
- Most Serene Republic of San Marino (2011-)
Yugoslavia
- State of Slovenes, Croats and Serbs (1918)
- Kingdom of Serbs, Croats and Slovenes (1918-1929)
- Kingdom of Yugoslavia (1929-1941)
- Government of the Kingdom of Yugoslavia in Exile (1941-1945)
- National Liberation Army and Partisan Detachments of Yugoslavia (1941-1945)
- Chetnik Detachments of the Yugoslav Army (1941-1946)
- Democratic Federal Yugoslavia (1943-1945)
- Federal People's Republic of Yugoslavia (1945-1963)
- Socialist Federal Republic of Yugoslavia (1963-1992)
- Federal Republic of Yugoslavia (1992-2003)
- State Union of Serbia and Montenegro (2003-2006)
Bulgaria
- Eastern Rumelia (1900-1908)
- Principality of Bulgaria (Ottoman Vassal) (1900-1908)
- Third Bulgarian Tsardom (1908-1944)
- Provisional Government of Western Thrace (1913)
- Independent Government of Western Thrace (1913)
- Soviet occupation of Bulgaria (1944)
- Third Bulgarian Tsardom (1944-1946)
- People's Republic of Bulgaria (1946-1949)
- People's Republic of Bulgaria (Soviet Satellite) (1949 -1967)
- People's Republic of Bulgaria (Soviet Satellite) (1967-1971)
- People's Republic of Bulgaria (Soviet Satellite) (1971-1990)
- Republic of Bulgaria (1990-)
Finland
- Grand Duchy of Finland (1900-1917)
- White Finland (1917-1918)
- Finnish Socialist Workers' Republic (1918)
- Kingdom of Finland (German Puppet) (1918)
- Kingdom of Finland (1918-1919)
- Republic of Finland (1919-)
- Åland Islands (1921-1954)
- Finnish Democratic Republic (1939-1940)
- Karelo-Finnish Soviet Socialist Republic (1940-1953)
- Finnish Military Administration in Eastern Karelia (1941-1944)
- Karelo-Finnish Soviet Socialist Republic (1953-1956)
- Åland Islands (1954-)
Czechoslovakia
- First Czechoslovak Republic (1918-1920)
- First Czechoslovak Republic (1920-1938)
- Second Czechoslovak Republic (1938-1939)
- Carpatho-Ukraine (1939)
- Provisional Government of Czechoslovakia (1939-1945)
- Soviet occupation of Czechoslovakia (1944-1945)
- Third Czechoslovak Republic (1945-1948)
- Czechoslovak Socialist Republic (Soviet Satellite) (1948-1960)
- Czechoslovak Socialist Republic (1960-1968)
- Czechoslovak Socialist Republic (Soviet Satellite) (1968-1990)
- Velvet Revolution (1989)
- Czech and Slovak Federative Republic (1990-1992)
Czechia
- Protectorate of Bohemia and Moravia (German Protectorate) (1939-1945)
- Czech Socialist Republic (1969-1990)
- Czech Republic (1990-1992)
- Czech Republic (1992-)
Slovakia
- Slovak Soviet Republic (Hungarian Puppet) (1919)
- Slovak Republic (German Puppet) (1939-1945)
- Slovak Socialist Republic (1969-1990)
- Slovak Republic (1990-1992)
- Slovak Republic (1992-)
Greece
- Kingdom of Greece (1900-1924) (1935-1941) (1944-1967)
- Second Hellenic Republic (1924-1935)
- Greek government-in-exile (1941-1944)
- National Resistance (1941-1944)
- Hellenic State (Italian Puppet) (1941-1943)
- Hellenic State (German Puppet) (1943-1944)
- Kingdom of Greece (1967-1973)
- Hellenic Republic (1973-1974)
- Hellenic Republic (1974-1978)
- Hellenic Republic (1978-)
Monaco
- Principality of Monaco (1900-1942) (1944-)
- Italian occupation of Monaco (1942-1943)
- German occupation of Monaco (1943-1944)
Ireland
- Ireland (1900-1921)
- Irish Republic (1919-1922)
- Southern Ireland (1921-1922)
- Irish Free State (British Dominion) (1922-1937)
- Dominion of Éire (British Dominion) (1937-1949)
- Republic of Ireland (1949-)
Liechtenstein
- Principality of Liechtenstein (1900-1921)
- Principality of Liechtenstein (1921-1937)
- Principality of Liechtenstein (1937-1982)
- Principality of Liechtenstein (1982-)
Faroe Islands
- Colony of the Faroe Islands (1900-1940) (1945-1948)
- British occupation of the Faroe Islands (1940-1945)
- Faroe Islands (1948-)
Iceland
- Colony of Iceland (1900-1918)
- Kingdom of Iceland (Danish Dominion) (1918-1940)
- British occupation of Iceland (1940-1941)
- Canadian occupation of Iceland (1940-1941)
- American occupation of Iceland (1941-1945)
- Republic of Iceland (1945-)
Bosnia and Herzegovina
- Condominium of Bosnia and Herzegovina (1900-1918)
- Bosnia (1900-1908)
- Herzegovina (1900-)
- Bosnia (1908)
- Bosnia (1908-)
- Socialist Republic of Bosnia and Herzegovina (1943-1992)
- Republic of Bosnia and Herzegovina (1992-1995)
- United Nations Mission in Bosnia and Herzegovina (1995-2002)
- Bosnia and Herzegovina (1995-1998)
- Bosnia and Herzegovina (1998-)
- European Union Police Mission in Bosnia and Herzegovina (2002-2012)
Gibraltar
- Crown Colony of Gibraltar (1900-1939)
- Crown Colony of Gibraltar (1939-1981)
- British Dependent Territory of Gibraltar (1981-1982)
- British Dependent Territory of Gibraltar (1982-2002)
- British Overseas Territory of Gibraltar (2002-)
Andorra
- Principality of Andorra (1900-1934) (1934-1936) (1971-)
- Principality of Andorra (1934)
- French occupation of Andorra (1936-1940)
- Principality of Andorra (1940-1971)
Soviet Union
- Union of Soviet Socialist Republics (1922-1923)
- Union of Soviet Socialist Republics (1923-1924)
- Union of Soviet Socialist Republics (1924-1936)
- Union of Soviet Socialist Republics (1936-1955)
- Union of Soviet Socialist Republics (1955-1991)
- Commonwealth of Independent States (1991-)
- Collective Security Treaty Organization (1992-)
- Union State (1996-)
- Eurasian Economic Union (2014-)
Portugal
- Kingdom of Portugal (1900-1910)
- Portuguese Colonial Empire (1900-1910)
- First Portuguese Republic (1910-1926)
- Portuguese Colonial Empire (1910-1999)
- Monarchy of the North (1919)
- National Dictatorship (1926-1933)
- Second Portuguese Republic (1933-1974)
- National Salvation Junta (1974-1975)
- Portuguese Republic (1975-)
Sweden
- United Kingdoms of Sweden and Norway (1900-1905)
- Kingdom of Sweden (1905-)
Hungary
- Lands of the Crown of Saint Stephen (1900-1918)
- First Hungarian Republic (1918-1919) (1919)
- Hungarian Soviet Republic (1919)
- Hungarian Republic (1919-1920)
- Kingdom of Hungary (1920-1944) (1945-1946)
- Government of National Unity (German Puppet) (1944-1945)
- Soviet occupation of Hungary (1944)
- Second Hungarian Republic (1946-1949)
- Hungarian People's Republic (Soviet Satellite) (1949-1956)
- Hungarian Uprising (1956)
- Hungarian People's Republic (Soviet Satellite) (1956-1957)
- Hungarian People's Republic (Soviet Satellite) (1957-1989)
- Hungary (1989-)
Romania
- Kingdom of Romania (1900-1940) (1941-1944) (1944-1947)
- National Legionary State (1940-1941)
- Soviet occupation of Romania (1944)
- Romanian People's Republic (Soviet Satellite) (1947-1948)
- Romanian People's Republic (Soviet Satellite) (1948-1952)
- Romanian People's Republic(Soviet Satellite) (1952-1965)
- Socialist Republic of Romania (1965-1989)
- Romanian Uprising (1989)
- Romania (1989-)
Alsace and Lorraine
- Imperial Territory of Alsace-Lorraine (1900-1918)
- Alsace-Lorraine Soviet Republic (1918)
- Alsace (1918-1949)
- Lorraine (1918-)
- Alsace (1949-2008)
- Alsace (2008-)

North America

United States of America
- United States of America (1900-1908)
- United States of America (1908-1912)
- United States of America (1912-1959)
- United States of America (1959-1960)
- United States of America (1960-)
Canada
- Dominion of Canada (British Dominion) (1900-1921)
- Dominion of Canada (British Dominion) (1921-1953)
- Canada (British Commonwealth Realm) (1953-1957)
- Canada (British Commonwealth Realm) (1957-1965)
- Canada (British Commonwealth Realm) (1965-)
Mexico
- United Mexican States (1900-1916)
- United Mexican States (1916-1934)
- United Mexican States (1934-1968)
- United Mexican States (1968-)
Bermuda
- Crown Colony of Bermuda (1900-1910)
- Crown Colony of Bermuda (1910-1981)
- British Dependent Territory of Bermuda (1981-1999)
- British Dependent Territory of Bermuda (1999-2002)
- British Overseas Territory of Bermuda (2002-)
Newfoundland and Labrador
- Newfoundland Colony (1900-1907)
- Dominion of Newfoundland (British Dominion) (1907-1949)
- Newfoundland and Labrador (Canadian Province) (1949-1980)
- Newfoundland (1949-1980)
- Labrador (1949-1980)
- Newfoundland and Labrador (Canadian Province) (1980-)
- Newfoundland (1980-)
- Labrador (1980-)
Alaska
- Territory of Alaska (1900-1959)
- State of Alaska (1959-)
Greenland
- Colony of Greenland (1900-1940) (1945-1979)
- American occupation of Greenland (1940-1945)
- Greenland (1979-)
Virginia
- Commonwealth of Virginia (1900-1950)
- Commonwealth of Virginia (1950-)

Asia

Japan
- Empire of Japan (1900-1945)
- Empire of Japan (1945-1947)
- United States Military Government of the Ryukyu Islands (1945-1950)
- State of Japan (1947-1952)
- United States Civil Administration of the Ryukyu Islands (1950-1959)
- State of Japan (1952-1999)
- United States Civil Administration of the Ryukyu Islands (1959-1960)
- United States Civil Administration of the Ryukyu Islands (1960-1972)
- State of Japan (1999-)
China
- Republic of China
  - Great Qing (1900-1912)
  - Society of the Righteous and Harmonious Fists (1900-1901)
  - First Republic of China (1912-1915) (1916-1928)
  - Empire of China (1915-1916)
  - Empire of China (1916)
  - Republic of China (1928-)
  - State of Manchuria (1932-1934)
  - Empire of Great Manchuria (1934-1945)
  - East Hebei Autonomous Government (Japanese Puppet) (1935-1938)
  - Provisional Government of the Republic of China (Japanese Puppet) (1937-1940)
  - Reformed Government of the Republic of China (Japanese Puppet) (1938-1940)
  - Reorganized National Government of the Republic of China (Japanese Puppet) (1940-1943)
  - Reorganized National Government of the Republic of China (Japanese Puppet) (1943-1945)
- People's Republic of China
  - Hunan Soviet (1927)
  - Guangzhou Commune (1927)
  - Soviet Zone of China (1927-1949)
  - Shinmin Prefecture (1929-1932)
  - Chinese Soviet Republic (1931-1937)
  - Jiangxi–Fujian Soviet (1931-1934)
  - People's Revolutionary Government of the Republic of China (1933-1934)
  - Soviet occupation of Manchuria (1945-1946)
  - People's Republic of China (1949-)
- Chinese Warlords
  - Guangxi
    - Old Guangxi Clique (1911-1925)
    - New Guangxi Clique (1925-1949)
  - Qinghai
    - Ma Clique (1915-1931)
    - Ma Clique (1931-1949)
  - Yunnan
    - Yunnan Clique (1911-1927)
    - Yunnan Clique (1927-1949)
  - Shanxi
    - Shanxi Clique (1911-1927)
    - Shanxi Clique (1927-1949)
  - Xinjiang
    - Xinjiang Clique (1912-1928)
    - Xinjiang Clique (1928-1933)
    - Xinjiang clique (Soviet Puppet) (1933-1944)
    - First East Turkestan Republic (1933-1934)
    - Second East Turkestan Republic (Soviet Puppet) (1944-1949)
    - East Turkestan Islamic Movement (1988-1999)
    - East Turkistan Education and Solidarity Association (1998-)
    - Turkistan Islamic Movement (1999-)
Philippines
- United States Military Government of the Philippine Islands (1900-1902)
- Insular Government of the Philippine Islands (1901-1935)
- Commonwealth of the Philippines (American Protectorate) (1935-1942) (1945-1946)
- Philippine Resistance Movement (1941-1945)
- Hukbalahap (1942-1954)
- Philippine Executive Commission (1942-1943)
- Second Philippine Republic (1943-1945)
- Third Republic of the Philippines (1946-1965)
- Fourth Republic of the Philippines (1965-1986)
- Republic of the Philippines (1986-1998)
- Republic of the Philippines (1998-)
Thailand
- Kingdom of Siam (1900-1916)
- Kingdom of Siam (1916-1917)
- Kingdom of Siam (1917-1939)
- Kingdom of Thailand (1939-)
- Free Thai Movement (1941-1945)
- British occupation of Thailand (1946)
Tibet
- Ganden Phodrang (1900-1959)
- Tibet (Qing Protectorate) (1900-1912)
- Kingdom of Tibet (British Protectorate) (1904-1944)
- Kingdom of Tibet (1944-1950)
- Central Tibetan Administration (1959-)
- Chinese occupation of Tibet (1951)
- Tibet Area (1951-1965)
- Tibet Autonomous Region (1965-)
Brunei
- Nation of Brunei, the Abode of Peace (British Protectorate) (1900-1959)
- Nation of Brunei, the Abode of Peace (British Protectorate) (1959-1984)
- Nation of Brunei, the Abode of Peace (1984-)
Sarawak
- Kingdom of Sarawak (British Protectorate) (1900-1946)
- Crown Colony of Sarawak (1946-1963)
- State of Sarawak (Malaysian State) (1963-1973)
- State of Sarawak (Malaysian State) (1973-1988)
- State of Sarawak (Malaysian State) (1988-)
Indonesia
- Dutch East Indies (1900-1942) (1945-1949)
- Japanese occupation of the Dutch East Indies (1942-1945)
- Republic of the United States of Indonesia (1949-1950)
- Republic of Indonesia (1950-)
- Republic of South Maluku (1950-1963)
- Netherlands New Guinea (1949-1962)
- United Nations Temporary Executive Authority (1962-1963)
- Free Papua Movement (1963-)
- United Liberation Movement for West Papua (2014-)
Cambodia
- French Protectorate of Cambodia (1900-1941) (1945-1953)
- Kingdom of Cambodia (Japanese Puppet) (1941-1945)
- Kingdom of Cambodia (1953-1970)
- Khmer Republic (1970-1975)
- Kampuchea (1975-1976)
- Democratic Kampuchea (1976-1979)
- People's Republic of Kampuchea (1979-1989)
- State of Cambodia (1989-1992)
- United Nations Transitional Authority in Cambodia (1992-1993)
- Coalition Government of Democratic Kampuchea (1982-1990)
- National Government of Cambodia (1990-1994)
- Provisional Government of National Union and National Salvation of Cambodia (1994-1998)
- Kingdom of Cambodia (1993-)
Korea
- Korean Empire (1900-1905)
- Korean Empire (Japanese Protectorate) (1905-1910)
- Chōsen (Japanese Colony) (1910-1945)
- Provisional Government of the Republic of Korea (1919-1948)
- People's Republic of Korea (1945-1946)
- Soviet Civil Administration (1945–1946)
- Provisional People's Committee for North Korea (1946-1948)
- People's Committee of North Korea (1947-1948)
- United States Army Military Government in Korea (1945-1948)
- Democratic People's Republic of Korea (1948-1992)
- Democratic People's Republic of Korea (1992-)
- First Republic of Korea (1948-1960)
- Second Republic of Korea (1960-1961)
- Supreme Council for National Reconstruction of the Republic of Korea (1961-1963)
- Third Republic of Korea (1963-1972)
- Fourth Republic of Korea (1972-1981)
- Fifth Republic of Korea (1981-1987)
- Republic of Korea (1987-)
Tuva
- Tuvan People's Republic (1921)
- Tuvan People's Republic (1921-1926)
- Tuvan People's Republic (1926-1930)
- Tuvan People's Republic (1930-1933)
- Tuvan People's Republic (1933-1941)
- Tuvan People's Republic (1941-1943)
- Tuvan People's Republic (1943-1944)
- Tuvan Autonomous Oblast (1944-1961)
- Tuvan Autonomous Soviet Socialist Republic (1961-1978)
- Tuvan Autonomous Soviet Socialist Republic (1978-1992)
- Tyva Republic (1992-)
Outer Mongolia
- Bogd Khanate of Mongolia (1911-1919) (1921)
- Chinese occupation of Mongolia (1919-1921)
- People's Republic of Mongolia (1921-1924)
- Mongolian People's Republic (1924-1930)
- Mongolian People's Republic (1930-1940)
- Mongolian People's Republic (1940-1945)
- Mongolian People's Republic (1945-1992)
- Mongolia (1992-2011)
- Mongolia (2011-)
Inner Mongolia
- Mongol Military Government (1936-1937)
- Mongol United Autonomous Government (1937-1939)
- Mengjiang United Autonomous Government (1939-1945)
- Inner Mongolian People's Republic (1945)
- Inner Mongolia Autonomous Region (1947-1979)
- Inner Mongolia Autonomous Region (1979-)

Middle East and North Africa

Israel
- State of Israel (1948-)
- Israeli Civil Administration (1981-)
Palestine
- Occupied Enemy Territory Administration (1917-1920)
- Mandatory Palestine (1920-1924)
- Mandatory Palestine (1924-1927)
- Mandatory Palestine (1927-1948)
- All-Palestine Protectorate (Egyptian Protectorate) (1948-1959)
- Jordanian occupation of the West Bank (1948-1967)
- Egyptian occupation of The Gaza Strip (1959-1967)
- Israeli Military Governorate (1967-1982)
- State of Palestine (1988-)
- Palestinian National Authority (1994-)
- European Union Police Mission in the Palestinian Territories (2005-)
Egypt
- Khedivate of Egypt (Ottoman Vassal) (1900-1914)
- Sultanate of Egypt (British Protectorate) (1914-1922)
- Kingdom of Egypt (British Protectorate) (1922-1936)
- Kingdom of Egypt (1936-1953)
- Free Officers Movement (1952-1953)
- Republic of Egypt (1953-1958)
- United Arab Republic (1958-1972)
- Federation of Arab Republics (1972-1977)
- Arab Republic of Egypt (1977-1984)
- Arab Republic of Egypt (1984-)
Iraq
- Kingdom of Iraq (British Mandate) (1920-1924)
- Kingdom of Iraq (British Mandate) (1924-1932)
- Hashemite Kingdom of Iraq (1932-1941)
- Kingdom of Iraq (British Puppet) (1941-1958)
- Arab Federation of Iraq and Jordan (1958)
- Iraqi Republic (1958-1963)
- Iraqi Republic (1963-1991)
- Iraqi Republic (1991-2003)
- Coalition Provisional Authority (2003-2004)
- Republic of Iraq (2004-2008)
- Republic of Iraq (2008-)
Iran
- Sublime State of Persia (1900-1910)
- Sublime State of Persia (1910-1925)
- Persian Socialist Soviet Republic (1920-1921)
- Imperial State of Persia (1925-1935)
- Imperial State of Iran (1935-1941) (1953-1979)
- Soviet occupation of Iran (1941-1946)
- Imperial State of Iran (British Puppet) (1941-1953)
- Azerbaijan People's Government (Soviet Puppet) (1945-1946)
- Republic of Mahabad (Soviet Puppet) (1946-1947)
- Interim Government of Iran (1979)
- Islamic Republic of Iran (1979-)
Oman
- Sultanate of Muscat and Oman (British Protectorate) (1900-1970)
- Sultanate of Oman (1970-1995)
- Sultanate of Oman (1995-)
United Arab Emirates
- Trucial States of the Coast of Oman (British Protectorate) (1900-1971)
- United Arab Emirates (1971-)
Qatar
- State of Qatar (1900-1916)
- State of Qatar (British Protectorate) (1916-1936)
- State of Qatar (British Protectorate) (1936-1949)
- State of Qatar (British Protectorate) (1949-1971)
- State of Qatar (1971-)
Bahrain
- State of Bahrain (British Protectorate) (1900-1932)
- State of Bahrain (British Protectorate) (1932-1971)
- State of Bahrain (1971-2002)
- Kingdom of Bahrain (2002-)
Kuwait
- Sheikhdom of Kuwait (British Protectorate) (1900-1914)
- Sheikhdom of Kuwait (British Protectorate) (1914-1921)
- Sheikhdom of Kuwait (British Protectorate) (1921-1940)
- Sheikhdom of Kuwait (British Protectorate) (1940-1961)
- Republic of Kuwait (1990)
- Kuwait Governorate (1990-1991)
- Saddamiyat al-Mitla' District (1990-1991)
- State of Kuwait (1961-1990) (1991-)
Jordan
- Emirate of Transjordan (British Mandate) (1921-1939)
- Emirate of Transjordan (British Mandate) (1939-1946)
- Hashemite Kingdom of Jordan (1946-)
Morocco
- Kingdom of Morocco (1900-1912) (1956-)
- French Protectorate in Morocco (1912-1956)
- Spanish protectorate in Morocco (1912-1956)
- Confederal Republic of the Tribes of the Rif (1921-1926)
- Tangier International Zone (1924-1956)
Saudi Arabia
- Emirate of Jabal Shammar (1900-1921)
- Emirate of Nejd and Hasa (1902-1921)
- Idrisid Emirate of Asir (1906-1934)
- Hashemite Kingdom of Hejaz (1916-1917)
- Hashemite Kingdom of Hejaz (1917-1920)
- Hashemite Kingdom of Hejaz (1920-1926)
- Sultanate of Nejd (1921-1926)
- Kingdom of Hejaz and Nejd (1926-1932)
- Kingdom of Saudi Arabia (1932-1934)
- Kingdom of Saudi Arabia (1934-1938)
- Kingdom of Saudi Arabia (1938-1973)
- Kingdom of Saudi Arabia (1973-)

Oceania

Australia
- Aboriginal Australians (1900-)
- New South Wales Colony (1900-1901)
- Colony of Western Australia (1900-1901)
- Province of South Australia (1900-1901)
- Victoria Colony (1900-1901)
- Colony of Tasmania (1900-1901)
- Queensland Colony (1900-1901)
- Commonwealth of Australia (British Dominion) (1901-1953)
- Commonwealth of Australia (British Commonwealth Realm) (1953-)
New Zealand
- United Tribes of New Zealand (1900-)
- Colony of New Zealand (1900-1907)
- Dominion of New Zealand (British Dominion) (1907-1953)
- New Zealand (British Commonwealth Realm) (1953-)
Tonga
- Kingdom of Tonga (British Protectorate) (1900-1970)
- Kingdom of Tonga (1900) (1970-)
Hawaii
- Territory of Hawaii (1900-1959)
- State of Hawaii (1959-)

India

India
- British Raj (1900-1947)
- Provisional Government of Free India (Japanese Puppet) (1943-1945)
- Interim Government of India (1946-1947)
- Dominion of India (British Dominion) (1947-1950)
- Republic of India (1950-)
Pakistan
- Dominion of Pakistan (British Dominion) (1947-1956)
- West Pakistan (1947-1971)
- Islamic Republic of Pakistan (1956-)
Bangladesh
- East Pakistan (1955-1971)
- People's Republic of Bangladesh (1971-1972)
- People's Republic of Bangladesh (1972-)
Nepal
- Kingdom of Nepal (British Protectorate) (1900-1923)
- Kingdom of Nepal (1923-1962)
- Kingdom of Nepal (1962-2008)
- Federal Democratic Republic of Nepal (2008-)
Bhutan
- Kingdom of Bhutan (1900-1910) (1947-1956)
- Kingdom of Bhutan (British Protectorate) (1910-1947)
- Kingdom of Bhutan (1956-1969)
- Kingdom of Bhutan (1969-)
Sikkim
- Kingdom of Sikkim (British Protectorate) (1900-1914)
- Kingdom of Sikkim (British Protectorate) (1914-1947)
- Kingdom of Sikkim (1947-1950)
- Kingdom of Sikkim (Indian Protectorate) (1950-1962)
- Kingdom of Sikkim (Indian Protectorate) (1962-1967)
- Kingdom of Sikkim (Indian Protectorate) (1967-1975)
- State of Sikkim (Indian State) (1975-)
Sri Lanka
- British Ceylon (1900-1948)
- Dominion of Ceylon (British Dominion) (1948-1951)
- Dominion of Ceylon (British Dominion) (1951-1972)
- Democratic Socialist Republic of Sri Lanka (1972-)
Maldives
- Sultanate of Maldives (British Protectorate) (1900-1903)
- Sultanate of Maldives (British Protectorate) (1903-1926)
- Sultanate of Maldives (British Protectorate) (1926-1953)
- Sultanate of Maldives (British Protectorate) (1953-1954)
- Sultanate of Maldives (British Protectorate) (1954-1965)
- United Suvadive Republic (1959-1963)
- Republic of Maldives (1965-)

Africa

South Africa
- Cape of Good Hope (1900-1910)
- Colony of Natal (1900-1910)
- South African Republic (1900-1902) (1914-1915)
- Orange Free State (1900-1902)
- Transvaal Colony (1902-1910)
- Orange River Colony (1902-1910)
- Union of South Africa (British Dominion) (1910-1928)
- Union of South Africa (British Dominion) (1928-1953)
- Union of South Africa (British Commonwealth Realm) (1953-1961)
- Republic of South Africa (1961-1994)
- Republic of Bophuthatswana (1977-1994)
- Republic of South Africa (1994-)
Democratic Republic of the Congo
- Congo Free State (1900-1908)
- Belgian Congo (1908-1960)
- Free Republic of the Congo (1960-1962)
- South Kasai (1960-1962)
- State of Katanga (1960-1963)
- Republic of the Congo (1960-1963)
- Republic of the Congo (1963-1964)
- Democratic Republic of the Congo (1964-1966)
- Democratic Republic of the Congo (1966-1971)
- Republic of Zaire (1971-1997)
- Democratic Republic of the Congo (1997-2003)
- Democratic Republic of the Congo (2003-2006)
- Democratic Republic of the Congo (2006-)
Rwanda and Burundi
- Ruanda-Urundi (1922-1962)
- Rwanda
  - Kingdom of Rwanda (German Protectorate) (1900-1919)
  - Kingdom of Rwanda (Belgian Protectorate) (1919-1962)
  - Republic of Rwanda (1962-2001)
  - Republic of Rwanda (2001-)
- Burundi
  - Kingdom of Burundi (German Protectorate) (1900-1919)
  - Kingdom of Burundi (Belgian Protectorate) (1919-1962)
  - Kingdom of Burundi(1962-1966)
  - Republic of Burundi (1966)
  - Republic of Burundi (1966-1967)
  - Republic of Burundi (1967)
  - Republic of Burundi (1967-)
Ethiopia
- Ethiopian Empire (1900-1936) (1944-1974)
- Italian Ethiopia (1936-1944)
- Italian East Africa (1936-1947)
- Provisional Military Government of Socialist Ethiopia (1974-1975)
- Provisional Military Government of Socialist Ethiopia (1975-1987)
- People's Democratic Republic of Ethiopia (1987-1991)
- Transitional Government of Ethiopia (1991-1995)
- Federal Democratic Republic of Ethiopia (1995-2009)
- Federal Democratic Republic of Ethiopia (2009-)
Somalia
- British Somaliland Protectorate (1900-1940) (1941-1952)
- Italian Somaliland (1900-1941)
- Dervish State (1900-1920)
- British Military Administration of Somalia (1941-1949)
- Trust Territory of Somaliland under Italian Administration (1949-1960)
- British Somaliland Protectorate (1952-1960)
- State of Somaliland (1960)
- Somali Republic (1960-1969)
- Somali Democratic Republic (1969-1991)
- Interim Government of Somalia (1991-1997)
- Republic of Somaliland (1991-1996)
- Republic of Somaliland (1996-)
- Transitional National Government of the Republic of Somalia (2000-2004)
- Transitional Federal Government of the Republic of Somalia (2004-2012)
- Federal Republic of Somalia (2012-)
Tanganyika
- German East Africa Company (1900-1920)
- German East Africa (1900-1914)
- German East Africa (1914-1919)
- Tanganyika Territory (1919-1961)
- Tanganyika (British Commonwealth Realm) (1961-1962)
- Republic of Tanganyika (1962-1964)
- United Republic of Tanzania (1964-)
Zanzibar
- Sultanate of Zanzibar (British Protectorate) (1900-1963)
- Sultanate of Zanzibar (1963-1964)
- People's Republic of Zanzibar and Pemba (1964)
- People's Republic of Zanzibar and Pemba (1964)
- Zanzibar (1964-2005)
- Zanzibar (2005-)
Zambia
- Rhodesia (1900-1924)
- Northern Rhodesia (1924-1953) (1963-1964)
- Federation of Rhodesia and Nyasaland (1953-1963)
- Republic of Zambia (1964-1996)
- Republic of Zambia (1996-)
Zimbabwe
- British South Africa Company (1900-1923)
- Colony of Southern Rhodesia (1923-1953) (1963-1964)
- Colony of Southern Rhodesia (1964-1965) (1979-1980)
- Rhodesia (1965-1968)
- Rhodesia (1968-1979)
- Zimbabwe Rhodesia (1979)
- Republic of Zimbabwe (1980-)

Central America and Caribbean

Dutch Caribbean
- Colony of Curaçao and Dependencies (1900-1936) (1948-1954)
- Territory of Curaçao (1936-1948)
- Netherlands Antilles (1954-1986)
- Aruba (1986-)
- Netherlands Antilles (1986-2010)
- Caribbean Netherlands (2010-)
- Bonaire (2010-)
- Curaçao (2010-)
- Sint Maarten (2010-)
- Sint Eustatius (2010-)
- Saba (2010-)
Cuba
- United States Military Government in Cuba (1900-1902)
- United States Naval Station Guantánamo Bay (1900-)
- Provisional Government of Cuba (1906-1908)
- Provisional Government of Cuba (1908-1909)
- First Republic of Cuba (1902-1906) (1909-1959)
- 26th of July Movement (1955-1965)
- Republic of Cuba (1959-)
Panama
- Republic of Panama (1903-1925)
- Panama Canal Zone (1903-1979)
- Republic of Panama (1925-)
Guatemala
- Republic of Guatemala (1900-1924)
- Republic of Guatemala (1924-)

South America

Suriname
- Colony of Surinam (1900-1954)
- Suriname (1954-1975)
- Republic of Suriname (1975-)
French Guiana
- French Guiana (1900-2010)
- French Guiana (2010-)
Guyana
- British Guiana (1900-1906)
- British Guiana (1906-1919)
- British Guiana (1919-1955)
- British Guiana (1955-1966)
- Guyana (British Commonwealth Realm) (1966-1970)
- Co-operative Republic of Guyana (1970-)

Alliance

United Nations
- Franco-Russian Alliance (1900-1914)
- The Entente (1914)
- The Entente (1914-1917)
- The Entente (1917-1919)
- League of Nations (1919-1939)
- League of Nations (1939-1946)
- United Nations (1939-1945)
- United Nations (1945-1947)
- United Nations (1947-)
European Union
- Treaty of Alliance and Mutual Assistance between the United Kingdom and France (1947-1948)
- Western Union (1948-1954)
- Western European Union (1954-1995)
- European Economic Community (1958-1993)
- European Atomic Energy Community (1958-)
- European Union (1993-)
- European Community (1993-2009)
- Western European Union (1995-2011)
European Coal and Steel Community
- International Authority for the Ruhr (1949-1952)
- European Coal and Steel Community (1952-1972)
- European Coal and Steel Community (1972-1980)
- European Coal and Steel Community (1980-1985)
- European Coal and Steel Community (1985-2002)
Paneuropean Union
- International Paneuropean Union (1923-1955)
- International Paneuropean Union (1955-)

City

Berlin
- City of Berlin (1900-1945)
- American occupation zone of Berlin (1945-1947)
- British occupation zone of Berlin (1945-1947)
- French occupation zone of Berlin (1945-1948)
- Soviet occupation zone of Berlin (1945-1949)
- City of West Berlin (1949-1990)
- City of East Berlin (1949-1990)
- City of Berlin (1990-)
- State of Berlin (1990-)
Tianjin
- Concessions in Tianjin
  - British Concession of Tianjin (1900-1943)
  - French Concession of Tianjin (1900-1946)
  - Japanese Concession of Tianjin (1900-1945)
  - German Concession of Tianjin (1900-1917)
  - Russian Concession of Tianjin (Russian Empire) (1900-1917)
  - Austro-Hungarian Concession of Tianjin (1901-1917)
  - Italian Concession of Tianjin (1901-1947)
  - Belgian Concession of Tianjin (1902-1931)
  - Russian Concession of Tianjin (Russian Republic) (1917)
  - Russian Concession of Tianjin (Russian Democratic Federative Republic) (1917-1918)
  - Russian Concession of Tianjin (Russian Soviet Republic) (1918-1920)
- Tianjin
  - City of Tianjin (1900-1912)
  - City of Tianjin (1912-1928)
  - City of Tianjin (1928-1937) (1945-1949)
  - City of Tianjin (1949-)
  - Tianjin Municipality (1967-)
Washington
- City of Washington (1900-1938)
- District of Columbia (1900-1938)
- City of Washington (1938-)
- District of Columbia (1938-)
Shanghai
- City of Shanghai (1900-1912)
- Shanghai French Concession (1900-1943)
- Shanghai International Settlement (1900-1914)
- Shanghai International Settlement (1914-1941)
- City of Shanghai (1912-1928)
- Shanghai Municipality (1927-1928)
- City of Shanghai (1928-1937) (1945-1949)
- Shanghai Municipality (1928-1937) (1945-1949)
- The Great Way Municipal Government of Shanghai (Japanese Puppet) (1937-1938)
- City of Shanghai (1949-)
- Shanghai Municipality (1949-)

Miscellaneous

North Atlantic Treaty Organization (1949-)
Treaty of Friendship, Cooperation, and Mutual Assistance (1955-1991)
Republic of Liberia (1900-)
Navajo Nation (1900-)
Swiss Confederation (1900-)
Neutral Moresnet (1900-1920)
Overseas Collectivity of Saint Pierre and Miquelon (1900-)
Persian Gulf Residency (1900-1947)
New England (1900-)

World War II

United Nations

British Empire
- United Kingdom of Great Britain and Northern Ireland
- Dominion of Canada
- Dominion of Newfoundland
- Dominion of Éire Did Not Enter War
- Dominion of New Zealand
- Commonwealth of Australia
- Union of South Africa
  - South West Africa
- British Raj

Rome–Berlin–Tokyo Axis

Germany

More