Africa

• Ethiopia - Zauditu
  Zauditu of Ethiopia
  Zewditu was Empress of Ethiopia from 1916 to 1930. The first woman head of an internationally recognized state in Africa in the 19th and 20th centuries, she was noted for opposing the reforms of Tafari Makonnen and for her strong religious devotion.-Early...
  
  , Emperor of Ethiopia
  Emperor of Ethiopia
  The Emperor of Ethiopia was the hereditary ruler of Ethiopia until the abolition of the monarchy in 1974. The Emperor was the head of state and head of government, with ultimate executive, judicial and legislative power in that country...
  
   (1916–1930)
• Liberia - Daniel E. Howard, President of Liberia (1912–1920)
• South Africa
  • Monarch - King George V
    George V of the United Kingdom
    George V was King of the United Kingdom and the British Dominions, and Emperor of India, from 6 May 1910 through the First World War until his death in 1936....
    
    , King of South Africa
    King of South Africa
    The King or Queen of South Africa was titular head of state of the Union of South Africa during the state's existence as a Dominion of the British Empire and later a Commonwealth Realm from 31 May 1910 to 31 May 1961, when the country became the Republic of South Africa...
    
     (1910–1936)
  • Governor-General - Viscount Buxton, Governor-General of South Africa (1914–1920)
  • Prime Minister -
    1. Louis Botha
       Louis Botha
       Louis Botha was an Afrikaner and first Prime Minister of the Union of South Africa—the forerunner of the modern South African state...
       
       , Prime Minister of South Africa 1910-1919)
    2. Jan Smuts
       Jan Smuts
       Jan Christiaan Smuts, OM, CH, ED, KC, FRS, PC was a prominent South African and British Commonwealth statesman, military leader and philosopher. In addition to holding various cabinet posts, he served as Prime Minister of the Union of South Africa from 1919 until 1924 and from 1939 until 1948...
       
       , Prime Minister of South Africa 1919-1924)
• Zanzibar - Sayyid Khalifa bin Harub Al-Busaid, Sultan of Zanzibar (1911–1960)

Asia

• Afghanistan
  • King -
    1. Habibullah Khan
       Habibullah Khan (Afghan king)
       Habibullah Khan was the Emir of Afghanistan from 1901 until 1919. He was born in Samarkand, Uzbekistan, the eldest son of the Emir Abdur Rahman Khan, whom he succeeded by right of primogeniture in October 1901....
       
       , King of Afghanistan (1901–1919)
    2. Nasrullah Khan, King of Afghanistan (1919-1919)
    3. Amanullah Khan
       Amanullah Khan
       Amanullah Khan was the King of the Emirate of Afghanistan from 1919 to 1929, first as Amir and after 1926 as Shah. He led Afghanistan to independence over its foreign affairs from the United Kingdom, and his rule was marked by dramatic political and social change...
       
       , King of Afghanistan (1919–1926)
• Brunei - Muhammad Jamalul Alam II
  Muhammad Jamalul Alam II
  Duli Yang Maha Mulia Sultan Muhammad Jamalul Alam ibni al-Marhum Sultan Hashim Jalilul Alam Aqamaddin, KCMG was the 26th Sultan of Brunei Darussalam .He was the eldest son of Sultan Hashim Jalilul Alam Aqamaddin...
  
  , Sultan of Brunei (1906–1924)
• China
  • President - Hsu Shih-Chang, President of the Republic of China
    President of the Republic of China
    The President of the Republic of China is the head of state and commander-in-chief of the Republic of China . The Republic of China was founded on January 1, 1912, to govern all of China...
    
     (1918–1922)
  • Premier -
    1. Qian Nengxun, Premier of the Republic of China
       Premier of the Republic of China
       The President of the Executive Yuan , commonly known as the Premier of the Republic of China , is the head of the Executive Yuan, the executive branch of the Republic of China , which currently administers Taiwan, Matsu, and Kinmen. The premier is appointed by the President of the Republic of China...
       
        (1918–1919)
    2. Gong Xinzhan
       Gong Xinzhan
       Gong Xinzhan was a politician in the end of Qing Dynasty and the Republic of China. He was a professional of finance in the Beijing Government, and was regarded a member of the Anhui clique. He also worked as the acting Prime Minister temporarily...
       
       , Acting Premier of the Republic of China
       Premier of the Republic of China
       The President of the Executive Yuan , commonly known as the Premier of the Republic of China , is the head of the Executive Yuan, the executive branch of the Republic of China , which currently administers Taiwan, Matsu, and Kinmen. The premier is appointed by the President of the Republic of China...
       
        (1919)
    3. Jin Yunpeng
       Jin Yunpeng
       Jin Yunpeng was a Chinese General and politician of the Warlord Era of the Republic of China. He served as both Minister of War and then Premier of China several times....
       
       , Premier of the Republic of China
       Premier of the Republic of China
       The President of the Executive Yuan , commonly known as the Premier of the Republic of China , is the head of the Executive Yuan, the executive branch of the Republic of China , which currently administers Taiwan, Matsu, and Kinmen. The premier is appointed by the President of the Republic of China...
       
        (1919–1920)
• Japan
  • Monarch - Taishō
    Emperor Taishō
    The was the 123rd emperor of Japan, according to the traditional order of succession, reigning from 30 July 1912, until his death in 1926.The Emperor’s personal name was . According to Japanese customs, the emperor has no name during his reign and is only called the Emperor...
    
    , Emperor of Japan
    Emperor of Japan
    The Emperor of Japan is, according to the 1947 Constitution of Japan, "the symbol of the state and of the unity of the people." He is a ceremonial figurehead under a form of constitutional monarchy and is head of the Japanese Imperial Family with functions as head of state. He is also the highest...
    
     (1912–1926)
  • Prime Minister - Hara Takashi
    Hara Takashi
    was a Japanese politician and the 19th Prime Minister of Japan from 29 September 1918 to 4 November 1921. He was also called Hara Kei informally. He was the first commoner appointed to the office of prime minister of Japan...
    
    , Prime Minister of Japan
    Prime Minister of Japan
    The is the head of government of Japan. He is appointed by the Emperor of Japan after being designated by the Diet from among its members, and must enjoy the confidence of the House of Representatives to remain in office...
    
     (1918–1921)
• Mongolia (Chinese occupation) - Bogd Khan
  Bogd Khan
  The Bogd Khan was enthroned as the Great Khaan of Mongolia on 29 December 1911, when Outer Mongolia declared independence from the Qing Dynasty after the Xinhai Revolution. He was born in the Kham region of eastern Tibet, today's Sichuan province of the People's Republic of China...
  
  , Khan of Mongolia (1911–1924)
• Oman - Taimur Bin Faisal, Sultan of Oman
  Sultan of Oman
  -List of Imams :-Nabhan Dynasty :-Ya'ariba Dynasty :-Banu Ghafir Dynasty :-Ya'ariba Dynasty :-Al Said Dynasty :-See also:...
  
   (1913–1932)

Australia and Oceania

• Australia -
  • Monarch - George V
    George V of the United Kingdom
    George V was King of the United Kingdom and the British Dominions, and Emperor of India, from 6 May 1910 through the First World War until his death in 1936....
    
    , King of the United Kingdom (1910–1936)
  • Governor-General - Ronald Munro-Ferguson, Governor-General of Australia
    Governor-General of Australia
    The Governor-General of the Commonwealth of Australia is the representative in Australia at federal/national level of the Australian monarch . He or she exercises the supreme executive power of the Commonwealth...
    
     (1914–1920)
  • Prime Minister - Billy Hughes, Prime Minister of Australia
    Prime Minister of Australia
    The Prime Minister of the Commonwealth of Australia is the highest minister of the Crown, leader of the Cabinet and Head of Her Majesty's Australian Government, holding office on commission from the Governor-General of Australia. The office of Prime Minister is, in practice, the most powerful...
    
     (1915–1923)
• Tonga
  • Monarch - Salote Tupou III
    Salote Tupou III of Tonga
    Sālote Mafile‘o Pilolevu Tupou III, GCMG, GCVO, GBE, DStJ , but usually named only Sālote, was Queen of Tonga from 5 April 1918 to her death in 1965.-Personal history:...
    
    , Queen of Tonga (1918–1965)
  • Prime Minister - T.P.Tu'ivakano, Prime Minister of Tonga
    Prime Minister of Tonga
    This is a list of Prime Ministers of Tonga from the establishment of that office in 1876 until the present day.-List of Premiers/Prime Ministers of Tonga :-External links:*...
    
    , (1912–1923)

Europe

• Albania -
  • Prime Minister - Turhan Përmeti, (1918–1920)
• Andorra
  • Co-Princes -
    • French Co-Prince - Raymond Poincaré
      Raymond Poincaré
      Raymond Poincaré was a French statesman who served as Prime Minister of France on five separate occasions and as President of France from 1913 to 1920. Poincaré was a conservative leader primarily committed to political and social stability...
      
      , President of France (1913–1920)
    • Episcopal Co-Prince -
      1. Joan Baptista Benlloch i Vivó, Bishop of Urgell (1907–1919)
      2. Jaume Viladrich i Gaspa (acting), Vicar capitular of Urgel (1919–1920)
  • First Syndic - Josep Vilanova, First Syndic of Andorra (1918–1920)
• Austria -
  • President - Karl Seitz
    Karl Seitz
    Karl Seitz was an Austrian politician and the first President of Austria.Karl Seitz was born in Vienna, then capital of the Austro-Hungarian empire, as the son of a struggling small-time coal trader. Following the premature death of his father in 1875, the family was thrown into abject poverty,...
    
    , President of Austria
    President of Austria
    The President of Austria is the federal head of state of Austria. Though theoretically entrusted with great power by the constitution, in practice the President acts, for the most part, merely as a ceremonial figurehead...
    
     (1919–1920)
  • Chancellor - Karl Renner
    Karl Renner
    Karl Renner was an Austrian politician. He was born in Untertannowitz in the Austro-Hungarian Empire and died in Vienna...
    
    , Chancellor of Austria
    Chancellor of Austria
    The Federal Chancellor is the head of government in Austria. Its deputy is the Vice-Chancellor. Before 1918, the equivalent office was the Minister-President of Austria. The Federal Chancellor is considered to be the most powerful political position in Austrian politics.-Appointment:The...
    
     (1918–1920)
• Belgium -
  • Monarch - Albert I
    Albert I of Belgium
    Albert I reigned as King of the Belgians from 1909 until 1934.-Early life:Born Albert Léopold Clément Marie Meinrad in Brussels, he was the fifth child and second son of Prince Philippe, Count of Flanders, and his wife, Princess Marie of Hohenzollern-Sigmaringen...
    
    , King of the Belgians (1909–1934)
  • Prime Minister - Léon Delacroix
    Léon Delacroix
    Léon Frédéric Gustave Delacroix was a Belgian statesman. Before entering politics, he was a renowned lawyer, and served as president of the Belgian Court of Cassation from 1917 to 1918. In the context of reconstruction after World War I, he was appointed the 22nd Prime Minister and served from...
    
    , Prime Minister of Belgium (1918–1920)
• Denmark
  • Monarch - Christian X
    Christian X of Denmark
    Christian X was King of Denmark from 1912 to 1947 and the only King of Iceland between 1918 and 1944....
    
    , King of Denmark (1912–1947)
  • Prime Minister - Carl Theodor Zahle
    Carl Theodor Zahle
    Carl Theodor Zahle , Danish lawyer and politician; prime minister of Denmark 1909-1910, 1913-1920. In 1895 he was elected member of the lower chamber of the Danish parliament, Folketinget, for Venstrereformpartiet...
    
    , Prime Minister of Denmark
    Prime Minister of Denmark
    The Prime Minister of Denmark is the head of government in Danish politics. The Prime Minister is traditionally the leader of a political coalition in the Folketing and presides over the cabinet....
    
     (1913–1920)
• Estonia -
  • Prime Minister -
    1. Konstantin Päts
       Konstantin Päts
       Konstantin Päts VR I/1 and III/1 was the most influential politician of interwar Estonia. He was one of the first Estonians to become active in politics and started an almost 40-year political rivalry with Jaan Tõnisson, first through journalism with his newspaper Teataja, later through politics...
       
       , Prime Minister
       Prime Minister of Estonia
       The Prime Minister of Estonia is the head of government of the Republic of Estonia. The prime minister is nominated by the President after appropriate consultations with the parliamentary factions and confirmed by the Parliament. In case of disagreement, the Parliament can reject the President's...
       
        of the Provisional Government of Estonia
       Estonian Provisional Government
       The Estonian Provisional Government was formed on February 24, 1918 by the Salvation Committee appointed by Maapäev the Estonian Province Assembly. The Provisional Government was led by Konstantin Päts...
       
        (1918–1919)
    2. Otto August Strandman, Prime Minister of Estonia
       Prime Minister of Estonia
       The Prime Minister of Estonia is the head of government of the Republic of Estonia. The prime minister is nominated by the President after appropriate consultations with the parliamentary factions and confirmed by the Parliament. In case of disagreement, the Parliament can reject the President's...
       
        (1919)
    3. Jaan Tõnisson
       Jaan Tõnisson
       Jaan Tõnisson VR I/3, II/3 and III/1 was an Estonian statesman, serving as the Prime Minister of Estonia twice during 1919 to 1920 and as the Foreign Minister of Estonia from 1931 to 1932.-Early life:...
       
       , Prime Minister of Estonia
       Prime Minister of Estonia
       The Prime Minister of Estonia is the head of government of the Republic of Estonia. The prime minister is nominated by the President after appropriate consultations with the parliamentary factions and confirmed by the Parliament. In case of disagreement, the Parliament can reject the President's...
       
        (1919–1920)
• Finland -
  • Regent - Carl Gustaf Emil Mannerheim
    Carl Gustaf Emil Mannerheim
    Baron Carl Gustaf Emil Mannerheim was the military leader of the Whites in the Finnish Civil War, Commander-in-Chief of Finland's Defence Forces during World War II, Marshal of Finland, and a Finnish statesman. He was Regent of Finland and the sixth President of Finland...
    
     (December 1918-1919)
  • President - Kaarlo Juho Ståhlberg
    Kaarlo Juho Ståhlberg
    Kaarlo Juho Ståhlberg was a Finnish jurist and academic, who played a central role in the drafting of the Constitution of Finland in 1919. He was the first President of Finland and a nationalist liberal.-Early life:...
    
    , President of Finland
    President of Finland
    The President of the Republic of Finland is the nation's head of state. Under the Finnish constitution, executive power is vested in the President and the government, with the President possessing extensive powers. The President is elected directly by the people of Finland for a term of six years....
    
     (1919–1925)
  • Prime Minister -
    1. Lauri Ingman
       Lauri Ingman
       Lauri Ingman was a Finnish theologian, bishop and politician. From 1916 to 1930 he was the professor of practical theology in the University of Helsinki...
       
       , Prime Minister of Finland
       Prime Minister of Finland
       The Prime Minister is the Head of Government of Finland. The Prime Minister is appointed by the President, who is the Head of State. The current Prime Minister is Jyrki Katainen of the National Coalition Party.-Overview:...
       
        (1918–1919)
    2. Kaarlo Castrén
       Kaarlo Castrén
       Kaarlo Castrén was a Finnish politician and Prime Minister of Finland . He represented the National Progressive Party.Castrén was born in Turtola and graduated in 1887 as a Bachelor of Law...
       
       , Prime Minister of Finland
       Prime Minister of Finland
       The Prime Minister is the Head of Government of Finland. The Prime Minister is appointed by the President, who is the Head of State. The current Prime Minister is Jyrki Katainen of the National Coalition Party.-Overview:...
       
        (1919)
    3. Juho Vennola
       Juho Vennola
       Juho Heikki Vennola was Professor of National Economics at the University of Helsinki, a member of the Parliament of Finland, and a politician from the National Progressive Party, who served as Prime Minister of Finland for three times.Vennola's first government was from August 15, 1919 to March...
       
       , Prime Minister of Finland
       Prime Minister of Finland
       The Prime Minister is the Head of Government of Finland. The Prime Minister is appointed by the President, who is the Head of State. The current Prime Minister is Jyrki Katainen of the National Coalition Party.-Overview:...
       
        (1919–1920)
• France -
  • President - Raymond Poincaré
    Raymond Poincaré
    Raymond Poincaré was a French statesman who served as Prime Minister of France on five separate occasions and as President of France from 1913 to 1920. Poincaré was a conservative leader primarily committed to political and social stability...
    
    , President of France (1913–1920)
  • Prime Minister - Georges Clemenceau
    Georges Clemenceau
    Georges Benjamin Clemenceau was a French statesman, physician and journalist. He served as the Prime Minister of France from 1906 to 1909, and again from 1917 to 1920. For nearly the final year of World War I he led France, and was one of the major voices behind the Treaty of Versailles at the...
    
    , President of the Council
    Prime Minister of France
    The Prime Minister of France in the Fifth Republic is the head of government and of the Council of Ministers of France. The head of state is the President of the French Republic...
    
     (1917–1920)
• Germany -
  • Head of State -
    1. Central Council of the German Socialist Republic (1918–1919)
    2. Wilhelm Pfannkuch, President of the Constituent Assembly (1919)
    3. Eduard David
       Eduard David
       Eduard Heinrich Rudolph David was a German politician. During the Weimar Republic he was the Minister of the Interior from 21 June 1919 to 3 October 1919....
       
       , President of the Constituent Assembly (1919)
    4. Friedrich Ebert
       Friedrich Ebert
       Friedrich Ebert was a German politician of the Social Democratic Party of Germany .When Ebert was elected as the leader of the SPD after the death of August Bebel, the party members of the SPD were deeply divided because of the party's support for World War I. Ebert supported the Burgfrieden and...
       
       , Reichspräsident
       Reichspräsident
       The Reichspräsident was the German head of state under the Weimar constitution, which was officially in force from 1919 to 1945. In English he was usually simply referred to as the President of Germany...
       
       ("Reich President") (1919–1925)
  • Head of Government -
    1. Friedrich Ebert
       Friedrich Ebert
       Friedrich Ebert was a German politician of the Social Democratic Party of Germany .When Ebert was elected as the leader of the SPD after the death of August Bebel, the party members of the SPD were deeply divided because of the party's support for World War I. Ebert supported the Burgfrieden and...
       
       , Executive Chairman of the Council of People's Commissioners (1918–1919)
    2. Philipp Scheidemann
       Philipp Scheidemann
       Philipp Scheidemann was a German Social Democratic politician, who proclaimed the Republic on 9 November 1918, and who became the second Chancellor of the Weimar Republic....
       
       , Prime Minister of Germany (1919)
    3. Gustav Bauer
       Gustav Bauer
       ' was a German Social Democratic Party leader and Chancellor of Germany from 1919 to 1920.Born in Darkehmen near Königsberg in East Prussia, Bauer, who rose to notice through his leadership of a white-collar trade union, served from 1908 to 1918 as chairman of the General Commission of Trade...
       
       , Chancellor of Germany (1919–1920)
• Greece
  • Monarch - Alexander
    Alexander of Greece
    Alexander reigned as King of Greece from 1917 to 1920 until his unusual death as the result of sepsis contracted by being bitten by two monkeys.-Early life:...
    
    , King of the Hellenes (1917–1920)
  • Prime Minister - Eleftherios Venizelos
    Eleftherios Venizelos
    Eleftherios Venizelos was an eminent Greek revolutionary, a prominent and illustrious statesman as well as a charismatic leader in the early 20th century. Elected several times as Prime Minister of Greece and served from 1910 to 1920 and from 1928 to 1932...
    
    , Prime Minister of Greece
    Prime Minister of Greece
    The Prime Minister of Greece , officially the Prime Minister of the Hellenic Republic , is the head of government of the Hellenic Republic and the leader of the Greek cabinet. The current interim Prime Minister is Lucas Papademos, a former Vice President of the European Central Bank, following...
    
     (1917–1920)
• Hungary
  • Head of State -
  1. Mihály Károlyi
     Mihály Károlyi
     Count Mihály Ádám György Miklós Károlyi de Nagykároly was briefly Hungary's leader in 1918-19 during a short-lived democracy...
     
     , President (1918–1919)
  2. Position vacant (during the Hungarian Soviet Republic) (21 March - 6 Aug. 1919)
  3. Archduke Joseph, Regent (6 Aug. - 23 Oct. 1919)
  4. István Friedrich
     István Friedrich
     István Friedrich was a Hungarian politician and factory owner who served as prime minister of Hungary for three months in 1919....
     
     , Regent (23 Oct. - 24 Nov. 1919)
  5. Position vacant (24 Nov. 1919 - 1 March 1920)
  • Head of Government -
  1. Mihály Károlyi
     Mihály Károlyi
     Count Mihály Ádám György Miklós Károlyi de Nagykároly was briefly Hungary's leader in 1918-19 during a short-lived democracy...
     
     , Prime Minister (31 Oct. 1918 - 19 Jan. 1919)
  2. Dénes Berinkey
     Dénes Berinkey
     Dénes Berinkey was a Hungarian jurist and politician who served as prime minister in the regime of Mihály Károlyi for two months in 1919. On March 20, 1919 the French presented the Vix Note ordering Hungarian troops further back into Hungary; it was widely assumed that the military lines would be...
     
     , Prime Minister (19 Jan. - 21 March 1919)
  3. Sándor Garbai
     Sándor Garbai
     Sándor Garbai was a Hungarian socialist politician. He came to power as prime minister in March 1919 in alliance with the Communists, and proclaimed a Soviet Republic...
     
     , President of the Revolutionary Governing Council (21 March - 1 Aug. 1919)
  4. Gyula Peidl
     Gyula Peidl
     Gyula Peidl was a Hungarian trade union leader and socialist politician who served briefly as the last prime minister and acting head of state of the Hungarian Soviet Republic in 1919....
     
     , Prime Minister (1 Aug. - 6 Aug. 1919)
  5. István Friedrich
     István Friedrich
     István Friedrich was a Hungarian politician and factory owner who served as prime minister of Hungary for three months in 1919....
     
     , Prime Minister (6 Aug. - 24 Nov. 1919)
  6. Károly Huszár
     Károly Huszár
     Károly Huszár de Sárvár was a Hungarian politician who served as prime minister and acting Head of State of Hungary from 1919 to 1920.-Biography:...
     
     , Prime Minister (24 Nov. 1919 - 15 March 1920)
• Italy
  • Monarch - Vittorio Emanuele III
    Victor Emmanuel III of Italy
    Victor Emmanuel III was a member of the House of Savoy and King of Italy . In addition, he claimed the crowns of Ethiopia and Albania and claimed the titles Emperor of Ethiopia and King of Albania , which were unrecognised by the Great Powers...
    
    , King of Italy
    King of Italy
    King of Italy is a title adopted by many rulers of the Italian peninsula after the fall of the Roman Empire...
    
     (1900–1946)
  • Prime Minister -
    1. Vittorio Orlando, Prime Minister of Italy
       Prime minister of Italy
       The Prime Minister of Italy is the head of government of the Italian Republic...
       
        (1917–1919)
    2. Francesco Nitti, Prime Minister of Italy
       Prime minister of Italy
       The Prime Minister of Italy is the head of government of the Italian Republic...
       
        (1919–1920)
• Luxembourg
  • Monarch -
    1. Marie-Adélaïde, Grand Duchess of Luxembourg
       Grand Duke of Luxembourg
       The Grand Duke of Luxembourg is the sovereign monarch and head of state of Luxembourg. Luxembourg has been a grand duchy since 15 March 1815, when it was elevated from a duchy when placed in personal union with the United Kingdom of the Netherlands...
       
        (1912-14 January 1919)
    2. Charlotte
       Charlotte, Grand Duchess of Luxembourg
       Charlotte, Grand Duchess of Luxembourg was the reigning Grand Duchess of Luxembourg from 1919 to 1964.-Early life and life as Grand Duchess:...
       
       , Grand Duchess of Luxembourg
       Grand Duke of Luxembourg
       The Grand Duke of Luxembourg is the sovereign monarch and head of state of Luxembourg. Luxembourg has been a grand duchy since 15 March 1815, when it was elevated from a duchy when placed in personal union with the United Kingdom of the Netherlands...
       
        (14 January 1919-1964)
  • Prime Minister - Émile Reuter, Prime Minister of Luxembourg (1918–1925)
• Netherlands -
  • Monarch - Wilhelmina
    Wilhelmina of the Netherlands
    Wilhelmina was Queen regnant of the Kingdom of the Netherlands from 1890 to 1948. She ruled the Netherlands for fifty-eight years, longer than any other Dutch monarch. Her reign saw World War I and World War II, the economic crisis of 1933, and the decline of the Netherlands as a major colonial...
    
    , Queen of the Netherlands
    Monarchy of the Netherlands
    The Netherlands has been an independent monarchy since 16 March 1815, and has been governed by members of the House of Orange-Nassau since.-Constitutional role and position of the monarch:...
    
     (1890–1948)
  • Prime Minister - Charles Ruijs de Beerenbrouck
    Charles Ruijs de Beerenbrouck
    Jhr. Charles Joseph Maria Ruijs de Beerenbrouck was a Dutch nobleman and Prime Minister of the Netherlands from 1918 to 1925 and again from 1929 to 1933...
    
    , Chairman of the Dutch council of ministers
    Prime Minister of the Netherlands
    The Prime Minister of the Netherlands is the chairman of the Council of Ministers of the Netherlands. He is the de facto head of government of the Netherlands and coordinates the policy of the government...
    
     (1918–1925, 1929–1933)
• Ottoman Empire
  • Monarch - Mehmed VI
    Mehmed VI
    Mehmet VI was the 36th and last Sultan of the Ottoman Empire, reigning from 1918 to 1922...
    
    , Sultan
    Ottoman Dynasty
    The Ottoman Dynasty ruled the Ottoman Empire from 1299 to 1922, beginning with Osman I , though the dynasty was not proclaimed until Orhan Bey declared himself sultan...
    
     (1918–1922)
• Poland
  • Head of State - Józef Piłsudzki -
    1. Provisional Chief of State (1918–1919)
    2. Chief of State (1919–1922)
  • Prime Minister -
    1. Jędrzej Moraczewski
       Jedrzej Moraczewski
       Jędrzej Moraczewski was a Polish socialist politician who served as first Prime Minister of Poland , from November 1918 to January 1919....
       
       , President of the Ministers (1918–1919)
    2. Ignacy Paderewski, President of the Ministers (1919)
    3. Leopold Skulski
       Leopold Skulski
       Leopold Skulski was prime minister of Poland from 1919 to 1920.He was involved in politics from at least the mid 1910s, and served as mayor of Łódź between 1917 an 1919. He became a deputy in the Polish parliament after the 1919 elections, and on 13 December 1919 he became the Prime Minister of...
       
       , President of the Ministers (1919–1920)
• Portugal -
  • President -
    1. João do Canto e Castro
       João do Canto e Castro
       João do Canto e Castro da Silva Antunes,, 8th marquess of Luiviada, 2nd duke of Notarmos, 22nd Lord of Guimevra, commonly known as João do Canto e Castro or just Canto e Castro was a Portuguese Marine officer and the fifth President of the Portuguese Republic from December 16, 1918 to October 5,...
       
       , President of Portugal
       President of Portugal
       Portugal has been a republic since 1910, and since that time the head of state has been the president, whose official title is President of the Portuguese Republic ....
       
        (Provisional) (1918–1919)
    2. António José de Almeida
       António José de Almeida
       António José de Almeida, GCTE, GCA, GCC, GCSE, , son of José António de Almeida and wife Maria Rita das Neves, was a Portuguese political figure...
       
       , President of Portugal
       President of Portugal
       Portugal has been a republic since 1910, and since that time the head of state has been the president, whose official title is President of the Portuguese Republic ....
       
        (1919–1923)
  • Prime Minister -
    1. João Tamagnini Barbosa
       João Tamagnini Barbosa
       João Tamagnini de Sousa Barbosa , commonly known by João Tamagnini Barbosa , or Tamagnini Barbosa, was a Portuguese military officer and politician of the Portuguese First Republic...
       
       , President of the Ministry
       Prime Minister of Portugal
       Prime Minister is the current title of the chief of the Portuguese Government. As chief executive, the Prime Minister coordinates the action of ministers, representing the Government from the other organs of state, accountable to Parliament and keeps the President informed...
       
        (1918–1919)
    2. José Relvas
       José Relvas
       José Maria Mascarenhas Relvas José Maria Mascarenhas Relvas José Maria Mascarenhas Relvas (Golegã, Golegã, March 5, 1858 - Alpiarça, Casa dos Patudos, October 31, 1929; , was a Portuguese politician.-Political career:...
       
       , President of the Ministry
       Prime Minister of Portugal
       Prime Minister is the current title of the chief of the Portuguese Government. As chief executive, the Prime Minister coordinates the action of ministers, representing the Government from the other organs of state, accountable to Parliament and keeps the President informed...
       
        (1919)
    3. Domingos Pereira, President of the Ministry
       Prime Minister of Portugal
       Prime Minister is the current title of the chief of the Portuguese Government. As chief executive, the Prime Minister coordinates the action of ministers, representing the Government from the other organs of state, accountable to Parliament and keeps the President informed...
       
        (1919)
    4. Alfredo de Sá Cardoso
       Alfredo de Sá Cardoso
       Alfredo Ernesto de Sá Cardoso , commonly known as Alfredo de Sá Cardoso , or just Sá Cardoso, was a Portuguese republican politician of the Portuguese First Republic, who served twice as Prime Minister of Portugal.- Biography :Sá Cardoso was the son of Adelaide Leopoldina de Sá Cardoso...
       
       , President of the Ministry
       Prime Minister of Portugal
       Prime Minister is the current title of the chief of the Portuguese Government. As chief executive, the Prime Minister coordinates the action of ministers, representing the Government from the other organs of state, accountable to Parliament and keeps the President informed...
       
        (1919–1920)
• Romania - Ferdinand, King of Romania
  King of Romania
  King of the Romanians , rather than King of Romania , was the official title of the ruler of the Kingdom of Romania from 1881 until 1947, when Romania was proclaimed a republic....
  
   (1914–1927)
• Sweden
  • Monarch - Gustaf V
    Gustaf V of Sweden
    Gustaf V was King of Sweden from 1907. He was the eldest son of King Oscar II of Sweden and Sophia of Nassau, a half-sister of Adolphe, Grand Duke of Luxembourg...
    
    , King of Sweden (1907–1950)
  • Prime Minister - Nils Edén
    Nils Edén
    Nils Edén was a Swedish historian and liberal politician, Prime Minister of Sweden 1917–1920, and along with Hjalmar Branting acknowledged as co-architect of Sweden's transition from quasi-absolute monarchy to a parliamentary democracy with equal male and female suffrage.Edén was born in...
    
    , Prime Minister of Sweden
    Prime Minister of Sweden
    The Prime Minister is the head of government in the Kingdom of Sweden. Before the creation of the office of a Prime Minister in 1876, Sweden did not have a head of government separate from its head of state, namely the King, in whom the executive authority was vested...
    
     (1917–1920)
• United Kingdom -
  • Monarch - George V
    George V of the United Kingdom
    George V was King of the United Kingdom and the British Dominions, and Emperor of India, from 6 May 1910 through the First World War until his death in 1936....
    
    , King of the United Kingdom (1910–1936)
  • Prime Minister - David Lloyd George
    David Lloyd George
    David Lloyd George, 1st Earl Lloyd-George of Dwyfor OM, PC was a British Liberal politician and statesman...
    
    , Prime Minister of the United Kingdom
    Prime Minister of the United Kingdom
    The Prime Minister of the United Kingdom of Great Britain and Northern Ireland is the Head of Her Majesty's Government in the United Kingdom. The Prime Minister and Cabinet are collectively accountable for their policies and actions to the Sovereign, to Parliament, to their political party and...
    
     (1916–1922)

North America and the Caribbean

• Canada
  • Monarch - King George V
    George V of the United Kingdom
    George V was King of the United Kingdom and the British Dominions, and Emperor of India, from 6 May 1910 through the First World War until his death in 1936....
    
    , King of Canada (1910–1936)
  • Governor-General - Duke of Devonshire
    Victor Cavendish, 9th Duke of Devonshire
    Victor Christian William Cavendish, 9th Duke of Devonshire , known as Victor Cavendish until 1908, was a British politician who served as Governor General of Canada, the 11th since Canadian Confederation....
    
    , Governor-General of Canada (1916–1921)
  • Prime Minister - Sir Robert Borden
    Robert Borden
    Sir Robert Laird Borden, PC, GCMG, KC was a Canadian lawyer and politician. He served as the eighth Prime Minister of Canada from October 10, 1911 to July 10, 1920, and was the third Nova Scotian to hold this office...
    
    , Prime Minister of Canada
    Prime Minister of Canada
    The Prime Minister of Canada is the primary minister of the Crown, chairman of the Cabinet, and thus head of government for Canada, charged with advising the Canadian monarch or viceroy on the exercise of the executive powers vested in them by the constitution...
    
     (1911–1920)
• Costa Rica -
  1. Federico Tinoco Granados
     Federico Tinoco Granados
     Term of office: 27 January 1917 to13 August 1919– Preceded by:  Alfredo González– Succeeded by: Juan Bautista QuirósDate of birth: 21 November 1868Place of birth:San JoséDate of death: 7 September 1931Place of death:Paris, France...
     
     , President of Costa Rica (1917–1919)
  2. Juan Bautista Quirós Segura
     Juan Bautista Quirós Segura
     Juan Bautista Quirós Segura was president of Costa Rica for two weeks, from August 20 to September 2, 1919, following the resignation of Federico Tinoco...
     
     , President of Costa Rica (1919)
  3. Francisco Aguilar Barquero
     Francisco Aguilar Barquero
     Term of office:2 September 1919 to8 May 1920– Preceded by:  Federico Tinoco– Succeeded by: Julio AcostaDate of birth: 21 May 1857Place of birth:CartagoDate of death: 11 October 1924Place of death:San JoséParty:...
     
     , President of Costa Rica (1919–1920)
• Cuba - Mario García Menocal
  Mario García Menocal
  Aurelio Mario García Menocal y Deop was President of Cuba, from 1913 to 1921...
  
  , President of Cuba (1913–1921)
• México - Venustiano Carranza
  Venustiano Carranza
  Venustiano Carranza de la Garza, was one of the leaders of the Mexican Revolution. He ultimately became President of Mexico following the overthrow of the dictatorial Huerta regime in the summer of 1914 and during his administration the current constitution of Mexico was drafted...
  
  , President of Mexico
  President of Mexico
  The President of the United Mexican States is the head of state and government of Mexico. Under the Constitution, the president is also the Supreme Commander of the Mexican armed forces...
  
   (1914–1920)
• Newfoundland
  • Monarch - King George V
    George V of the United Kingdom
    George V was King of the United Kingdom and the British Dominions, and Emperor of India, from 6 May 1910 through the First World War until his death in 1936....
    
    , King of Newfoundland {1910-1936}
  • Governor - Charles A. Harris, Governor of Newfoundland (1917–1922)
  • Prime Minister -
  1. William F. Lloyd
     William F. Lloyd
     Sir William Frederick Lloyd was a newspaper editor and Prime Minister of Newfoundland from 1918 to 1919....
     
     , Prime Minister of Newfoundland (1918–1919)
  2. Michael Patrick Cashin
     Michael Patrick Cashin
     Sir Michael Patrick Cashin, KBE was a Newfoundland businessman and politician....
     
     , Prime Minister of Newfoundland (1919)
  3. Richard Squires
     Richard Squires
     Sir Richard Anderson Squires KCMG was the Prime Minister of Newfoundland from 1919 to 1923 and from 1928 to 1932.-Early career:...
     
     , Prime Minister of Newfoundland (1919–1923)
• United States - Woodrow Wilson
  Woodrow Wilson
  Thomas Woodrow Wilson was the 28th President of the United States, from 1913 to 1921. A leader of the Progressive Movement, he served as President of Princeton University from 1902 to 1910, and then as the Governor of New Jersey from 1911 to 1913...
  
  , President of the United States
  President of the United States
  The President of the United States of America is the head of state and head of government of the United States. The president leads the executive branch of the federal government and is the commander-in-chief of the United States Armed Forces....
  
   (1913–1921)

South America

• Argentina - Hipólito Yrigoyen
  Hipólito Yrigoyen
  Juan Hipólito del Sagrado Corazón de Jesús Irigoyen Alem was twice President of Argentina . His activism became the prime impetus behind the obtainment of universal suffrage in Argentina in 1912...
  
  , President of Argentina
  President of Argentina
  The President of the Argentine Nation , usually known as the President of Argentina, is the head of state of Argentina. Under the national Constitution, the President is also the chief executive of the federal government and Commander-in-Chief of the armed forces.Through Argentine history, the...
  
   (1916–1922)
• Brazil -
  1. Delfim Moreira
     Delfim Moreira
     Delfim Moreira da Costa Ribeiro was a Brazilian politician. He was born in Minas Gerais state, and was elected vice-president in 1918. He assumed the presidency on November 15, 1918, due to the illness and death of former and now elect president Rodrigues Alves. However, Moreira suffered from...
     
     , Acting President of Brazil
     President of Brazil
     The president of Brazil is both the head of state and head of government of the Federative Republic of Brazil. The president leads the executive branch of the federal government and is the commander-in-chief of the Brazilian Armed Forces...
     
      (1918–1919)
  2. Epitâcio da Silva Pessoa, President of Brazil
     President of Brazil
     The president of Brazil is both the head of state and head of government of the Federative Republic of Brazil. The president leads the executive branch of the federal government and is the commander-in-chief of the Brazilian Armed Forces...
     
      (1919–1922)
• Paraguay -
  1. Manuel Franco
     Manuel Franco
     Manuel Franco was President of Paraguay. He was a model citizen and illustrious teacher.-Childhood and Youth:Doctor Manuel Franco was born in Concepción on June 9, 1871 in times of the government of Cirilo Antonio Rivarola...
     
     , President of Paraguay (1916–1919)
  2. José P. Montero, President of Paraguay (1919–1920)
• Peru -
  1. José Pardo y Barreda
     José Pardo y Barreda
     José Simón Pardo y Barreda was a Peruvian politician who twice occupied the Presidency of Peru, from 1904 to 1908 and 1915 to 1919....
     
     , President of Peru (1915–1919)
  2. Augusto B. Leguía y Salcedo, President of Peru (1919–1930)
• Uruguay -
  1. Feliciano Viera
     Feliciano Viera
     Feliciano Alberto Viera Borges was a Uruguayan political figure.-Background:He was a member of the Colorado Party and closely identified with the liberal former President José Batlle y Ordóñez, who long dominated Uruguayan political life...
     
     , President of Uruguay (1915–1919)
  2. Baltasar Brum
     Baltasar Brum
     Baltasar Brum Rodríguez was a Uruguayan political figure. He was President of Uruguay from 1919 to 1923.-Background:...
     
     , President of Uruguay (1919–1923)
• Venezuela - Victorino Márquez Bustillos, provisional President of Venezuela (1915–1922)