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 - Charles D.B. King, President of Liberia (1920–1930)
• 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 - Prince Arthur of Connaught
    Prince Arthur of Connaught
    Prince Arthur of Connaught and Strathearn was a member of the British Royal Family, a grandson of Queen Victoria. Prince Arthur held the title of a British prince with the style His Royal Highness...
    
    , Governor-General of South Africa (1920–1924)
  • Prime Minister - 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 - 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. 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...
       
        (1920–1921)
    2. Yan Huiqing
       Yan Huiqing
       Yan Huiqing Yan Huiqing Yan Huiqing (Wade-Giles: Yen Hui-Ching, (also known as W.W. Yen) 顏惠慶 (1877-1950) was a Chinese writer, politician, and diplomat from Shanghai.-Biography:...
       
       , 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...
       
        (1921)
    3. Liang Shiyi
       Liang Shiyi
       Liang Shiyi was premier of China's Beiyang government from 1921 to 1922.-Biography:Liang Shiyi was born in Sanshui, Guangdong in 1869. In the Qing dynasty, he was put in charge of railways, the most profitable ministry of the government. This allowed him to create the influential Communications...
       
       , 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...
       
        (1921–1922)
• 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 -
    1. 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)
    2. Takahashi Korekiyo
       Takahashi Korekiyo
       Viscount was a Japanese politician and the 20th Prime Minister of Japan from 13 November 1921 to 12 June 1922. He was known as an expert on finance during his political career.-Early life :...
       
       , 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...
       
        (1921–1922)
• Mongolia (Chinese and Russian occupations) - 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)
• Tuva -
  • Mongush Buyan-Badyrgy, Chairman of the Constituent Khural (1921)
  • Sodnam Balchir Ambyn-noyon, Chairman of the Central Council (1921–1922)

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 - Henry Forster, 1st Baron Forster of Lepe, 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...
    
     (1920–1925)
  • 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 -
  • Head of State -
    1. First High Council (1920–1921)
    2. Second High Council (1921–1925
  • Prime Minister -
    1. Iliaz Vrioni
       Iliaz Vrioni
       Iliaz Vrioni was an Albanian politician and land owner. He served as Prime Minister of Albania three times.- Biography :Iliaz Vrioni, was born in 1882 in Berat, Province of Ioannina of the Ottoman Empire and died in Paris in 1932. Member of the great Bey family of Berat, Fier and Myzeqe, formerly...
       
       , (1920–1921)
    2. Pandeli Evangjeli
       Pandeli Evangjeli
       Pandeli Evangjeli was an Albanian politician and Prime Minister of Albania twice. He was the first Orthodox Christian to become chief of the Albanian government....
       
       , (1921)
    3. Qazim Koculi
       Qazim Koculi
       Qazim Koculi was an Albanian politician of the early 20th century and one-day acting Prime Minister of Albania. He was also a distinguished military leader, having won the Vlora War in 1920, as the principal military commander of the Albanian forces.-Early life:Qazim, son of Muhamet Kociu, was...
       
       , (1921)
    4. Hasan Prishtina
       Hasan Prishtina
       Hasan Prishtina born Hasan Berisha was an Albanian politician, who served as Prime Minister of Albania in December 1921.-Biography:He studied politics and law in Istanbul...
       
       , (1921)
    5. Idhomene Kosturi, (1921)
    6. Xhafer Ypi
       Xhafer Ypi
       Xhafer Bej Ypi , a Bektashi Muslim, was an Albanian politician.Ypi's parents were Asilan and Zavalani.He was educated at a university in Istanbul.In 1920-1921 he was Minister of Internal Affairs and Minister of Justice...
       
       , (1921–1922)
• Andorra
  • Co-Princes -
    • French Co-Prince - Alexandre Millerand
      Alexandre Millerand
      Alexandre Millerand was a French socialist politician. He was President of France from 23 September 1920 to 11 June 1924 and Prime Minister of France 20 January to 23 September 1920...
      
      , President of France (1920–1924)
    • Episcopal Co-Prince - Justí Guitart i Vilardebó
      Justí Guitart i Vilardebó
      Justí Guitart i Vilardebó reigned as the Bishop of Urgell and Episcopal Co-Prince of Andorra from 1920 to 1940....
      
      , Bishop of Urgell (1920–1940)
  • First Syndic - Bonaventura Villarubia, First Syndic of Andorra (1920–1923)
• Austria -
  • President - Michael Hainisch
    Michael Hainisch
    Michael Hainisch was an Austrian politician, and the second President of Austria, after the fall of the monarchy at the end of World War I. He did not belong to any party and was an independent candidate...
    
    , 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...
    
     (1920–1928)
  • Chancellor -
    1. Michael Mayr
       Michael Mayr
       Michael Mayr was Chancellor of Austria in the First Austrian Republic, from November 1920 to June 1921. He was a member of the Christian Social Party, and by profession a historian.-Life:...
       
       , 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...
       
        (1920–1921)
    2. Johann Schober
       Johann Schober
       Johann Schober was an Austrian police officer who served three times as Chancellor of Austria .-Early career:...
       
       , 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...
       
        (1921–1922)
• Belarus -
  • Head of State - Aleksandr Chervyakov
    Aleksandr Chervyakov
    Aleksandr Grigoryevich Chervyakov was one of the founders and eventually became the leader of the Communist Party of Belorussia.He joined the Bolshevik Party in May 1917, and began to gain power quickly...
    
    , Chairman of the Central Executive Committee
    President of Belarus
    The office of President of Belarus is the head of state of Belarus. The office was created in 1994 with the passing of the Constitution of Belarus by the Supreme Soviet. This replaced the office of Chairman of the Supreme Soviet as the head of state...
    
     (1920–1937)
• 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 -
    1. Henri, comte Carton de Wiart, Prime Minister of Belgium (1920–1921)
    2. Georges Theunis
       Georges Theunis
       Georges Emile Léonard Theunis was the 24th Prime Minister of Belgium from 16 December 1921 to 13 May 1925 and again from 20 November 1934 to 25 March 1935. He was governor of the National Bank of Belgium from 1941 until 1944.He received a military training and was also trained as an engineer...
       
       , Prime Minister of Belgium (1921–1925)
• Bulgaria -
  • Monarch - Boris III
    Boris III of Bulgaria
    Boris III the Unifier, Tsar of Bulgaria , originally Boris Klemens Robert Maria Pius Ludwig Stanislaus Xaver , son of Ferdinand I, came to the throne in 1918 upon the abdication of his father, following the defeat of the Kingdom of Bulgaria during World War I...
    
    , King of the Bulgarians (1918–1943)
  • Prime Minister - Aleksandar Stamboliyski
    Aleksandar Stamboliyski
    Aleksandar Stamboliyski was the prime minister of Bulgaria from 1919 until 1923. Stamboliyski was a member of the Agrarian Union, an agrarian peasant movement which was not allied to the monarchy, and edited their newspaper...
    
    , Prime Minister of Bulgaria (1919–1923)
• Czechoslovakia -
  • President - Tomáš Masaryk
    Tomáš Masaryk
    Tomáš Garrigue Masaryk , sometimes called Thomas Masaryk in English, was an Austro-Hungarian and Czechoslovak politician, sociologist and philosopher, who as an eager advocate of Czechoslovak independence during World War I became the founder and first President of Czechoslovakia, also was...
    
    , President of Czechoslovakia (1918–1935)
  • Prime Minister -
    1. Jan Černý
       Jan Cerný
       Jan Černý was a Czechoslovakian civil servant and politician. He was the prime minister of Czechoslovakia from 1920 to 1921 and in 1926.-External links:...
       
       , Prime Minister of Czechoslovakia (1920–1921)
    2. Edvard Beneš
       Edvard Beneš
       Edvard Beneš was a leader of the Czechoslovak independence movement, Minister of Foreign Affairs and the second President of Czechoslovakia. He was known to be a skilled diplomat.- Youth :...
       
       , Prime Minister of Czechoslovakia (1921–1922)
• 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 - Niels Thomasius Neergaard, 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....
    
     (1920–1924)
• Estonia -
  • Head of Government -
    1. Ants Piip
       Ants Piip
       Ants Piip VR III/1 was an Estonian lawyer, diplomat and politician.-Education:Piip studied at the Teachers' Seminar in Kuldīga , now in Latvia...
       
       , State Elder of Estonia
       State Elder of Estonia
       The Head of State of Estonia was the official title of the Estonian head of state and head of government from 1920 to 1937...
       
        (1920–1921)
    2. 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...
       
       , State Elder of Estonia
       State Elder of Estonia
       The Head of State of Estonia was the official title of the Estonian head of state and head of government from 1920 to 1937...
       
        (1921–1922)
• Finland -
  • 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. Rafael Waldemar Erich, 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:...
       
        (1920–1921)
    2. Juho Heikki Vennola, 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:...
       
        (1921–1922)
• France -
  • President - Alexandre Millerand
    Alexandre Millerand
    Alexandre Millerand was a French socialist politician. He was President of France from 23 September 1920 to 11 June 1924 and Prime Minister of France 20 January to 23 September 1920...
    
    , President of France (1920–1924)
  • Prime Minister -
    1. Georges Leygues
       Georges Leygues
       Georges Leygues was a French politician of the Third Republic. During his time as Minister of Marine he worked with the navy's chief of staff Henri Salaun in unsuccessful attempts to gain naval re-armament priority for government funding over army rearmament such as the Maginot Line.He was born...
       
       , President of the Council of Ministers
       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...
       
        (1920–1921)
    2. Aristide Briand
       Aristide Briand
       Aristide Briand was a French statesman who served eleven terms as Prime Minister of France during the French Third Republic and received the 1926 Nobel Peace Prize.- Early life :...
       
       , President of the Council of Ministers
       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...
       
        (1921–1922)
• Germany -
  • President - 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...
    
    , President of Germany
    President of Germany
    The President of the Federal Republic of Germany is the country's head of state. His official title in German is Bundespräsident . Germany has a parliamentary system of government and so the position of President is largely ceremonial...
    
     (1919–1925)
  • Chancellor -
    1. Konstantin Fehrenbach
       Konstantin Fehrenbach
       Constantin Fehrenbach was a German Catholic politician who was one of the major leaders of the Centre Party. He served as President of the Reichstag in 1918, and then as President of the Weimar National Assembly from 1919 to 1920...
       
       , Chancellor of Germany (1920–1921)
    2. Joseph Wirth
       Joseph Wirth
       Karl Joseph Wirth, known as Joseph Wirth, was a German politician of the Catholic Centre Party who served as Chancellor of Germany from 1921 to 1922.-Biography:...
       
       , Chancellor of Germany (1921–1922)
• Greece -
  • Monarch - Constantine I
    Constantine I of Greece
    Constantine I was King of Greece from 1913 to 1917 and from 1920 to 1922. He was commander-in-chief of the Hellenic Army during the unsuccessful Greco-Turkish War of 1897 and led the Greek forces during the successful Balkan Wars of 1912–1913, in which Greece won Thessaloniki and doubled in...
    
    , King of the Hellenes (1920–1922
  • Prime Minister -
    1. Dimitrios Rallis
       Dimitrios Rallis
       Dimitrios Rallis was a Greek politician. Rallis was elected to Parliament in 1872 and always represented the same Athenian constituency. He became Minister in several governments and served as Prime Minister five times...
       
       , 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...
       
        (1920–1921)
    2. Nikolaos Kalogeropoulos
       Nikolaos Kalogeropoulos
       Nikolaos Kalogeropoulos was a Greek politician and briefly Prime Minister of Greece.Kalogeropoulos was born in Chalkida, Euboea, and studied law in Athens and Paris. He was elected a Member of the Hellenic Parliament a total of ten times representing Euboea and served as minister in several...
       
       , 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...
       
        (1921)
    3. Dimitrios Gounaris
       Dimitrios Gounaris
       Dimitrios Gounaris was the Prime Minister of Greece from March 10, 1915 to August 23, 1915 and April 8, 1921 to May 16, 1922...
       
       , 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...
       
        (1921–1922)
• Hungary -
  • Regent - Miklós Horthy
    Miklós Horthy
    Miklós Horthy de Nagybánya was the Regent of the Kingdom of Hungary during the interwar years and throughout most of World War II, serving from 1 March 1920 to 15 October 1944. Horthy was styled "His Serene Highness the Regent of the Kingdom of Hungary" .Admiral Horthy was an officer of the...
    
     (1920–1944)
  • Prime Minister -
    1. Count Pál Teleki
       Pál Teleki
       Pál Count Teleki de Szék was prime minister of Hungary from 19 July 1920 to 14 April 1921 and from 16 February 1939 to 3 April 1941. He was also a famous expert in geography, a university professor, a member of the Hungarian Academy of Sciences, and Chief Scout of the Hungarian Scout Association...
       
        (1920–1921)
    2. Count István Bethlen
       István Bethlen
       Count István Bethlen de Bethlen was a Hungarian aristocrat and statesman and served as Prime Minister from 1921 to 1931....
       
        (1921–1931)
• 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. Giovanni Giolitti
       Giovanni Giolitti
       Giovanni Giolitti was an Italian statesman. He was the 19th, 25th, 29th, 32nd and 37th Prime Minister of Italy between 1892 and 1921. A left-wing liberal, Giolitti's periods in office were notable for the passage of a wide range of progressive social reforms which improved the living standards of...
       
       , Prime Minister of Italy
       Prime minister of Italy
       The Prime Minister of Italy is the head of government of the Italian Republic...
       
        (1920–1921)
    2. Ivanoe Bonomi
       Ivanoe Bonomi
       Ivanoe Bonomi was an Italian politician and statesman before and after World War II.Bonomi was born in Mantua. He was elected to the Italian Chamber of Deputies in 1909, representing Mantua as a member of the Italian Socialist Party...
       
       , Prime Minister of Italy
       Prime minister of Italy
       The Prime Minister of Italy is the head of government of the Italian Republic...
       
        (1921–1922)
• Luxembourg
  • Monarch - Charlotte, 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...
    
     (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, Chief of State (1919–1922)
  • Prime Minister -
    1. Wincenty Witos
       Wincenty Witos
       Wincenty Witos was a prominent member of the Polish People's Party from 1895, and leader of its "Piast" faction from 1913. He was a member of parliament in the Galician Sejm from 1908–1914, and an envoy to Reichsrat in Vienna from 1911 to 1918...
       
       , President of the Ministers (1920–1921)
    2. Antoni Ponikowski
       Antoni Ponikowski
       Antoni Ponikowski was a Polish academician and politician who served as prime minister in 1918 and from 1921 to 1922....
       
       , President of the Ministers (1921–1922)
• Portugal -
  • President - 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. Liberato Pinto
       Liberato Pinto
       Liberato Damião Ribeiro Pinto was a Portuguese Lieutenant Colonel of the Republican National Guard , politician and President of the Ministry of one of the governments 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...
       
        (1920–1921)
    2. Bernardino Machado, 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...
       
        (1921)
    3. Tomé de Barros Queirós
       Tomé de Barros Queirós
       Tomé José de Barros Queirós was a Portuguese trader, capitalist and politician of the period 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...
       
        (1921)
    4. António Granjo
       António Granjo
       António Joaquim Granjo was a Portuguese lawyer and politician.He was a republican from his youth, and was a member of the National Constituent Assembly, elected on 28 May 1911...
       
       , 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...
       
        (1921)
    5. António Maria Coelho, 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...
       
        (1921)
    6. Carlos Maia Pinto
       Carlos Maia Pinto
       Carlos Henriques da Silva Maia Pinto , more commonly known as Carlos Maia Pinto, was a Portuguese military officer and republican politician during the Portuguese First Republic who, among others posts, served as President of the Ministry ....
       
       , 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...
       
        (1921)
    7. Francisco Cunha Leal
       Francisco Cunha Leal
       Francisco Pinto da Cunha Leal was a Portuguese politician during the period of the Portuguese First Republic. He served as President of the Ministry between 1921 and 1922....
       
       , 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...
       
        (1921–1922)
• Romania
  • Monarch - 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)
• Russia -
  • Head of State - Mikhail Kalinin
    Mikhail Kalinin
    Mikhail Ivanovich Kalinin , known familiarly by Soviet citizens as "Kalinych," was a Bolshevik revolutionary and the nominal head of state of Russia and later of the Soviet Union, from 1919 to 1946...
    
    , Chairman of the All-Russian Central Executive Committee (1919–1938)
  • Premier - Vladimir Lenin
    Vladimir Lenin
    Vladimir Ilyich Lenin was a Russian Marxist revolutionary and communist politician who led the October Revolution of 1917. As leader of the Bolsheviks, he headed the Soviet state during its initial years , as it fought to establish control of Russia in the Russian Civil War and worked to create a...
    
    , Chairman of the Council of People's Commissars (1917–1924)
• 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 -
  1. Gerhard Louis De Geer
     Gerhard Louis De Geer
     Baron Gerhard Louis De Geer of Finspång was a Swedish politician, who served in the first chamber of the Riksdag 1901-14, was governor of Kristianstad County 1905-23, and Prime Minister of Sweden for 121 days in 1920-1921.-Biography:Louis De Geer was son of the baron and former prime minister...
     
     , 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...
     
      (1920–1921)
  2. Oscar von Sydow
     Oscar von Sydow
     Oscar Fredrik von Sydow was a Swedish politician who served as Prime Minister of Sweden from February 23 to October 13, 1921.-Biography:...
     
     , 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...
     
      (1921)
  3. Hjalmar Branting
     Hjalmar Branting
     was a Swedish politician. He was the leader of the Swedish Social Democratic Party , and Prime Minister during three separate periods . When Branting came to power in 1920, he was the first Social Democratic Prime Minister of Sweden...
     
     , 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...
     
      (1921–1923)
• Ukraine -
  • Head of State - Grigory Petrovsky
    Grigory Petrovsky
    Grigory Ivanovich Petrovsky was one of the most prominent Russian revolutionaries of Ukrainian origin, who was the Chairman of the Central Executive Committee of the USSR from December 30, 1922, to January 12, 1938....
    
    , Chairman of the Central Executive Committee (1919–1938)
  • Premier - Christian Rakovsky
    Christian Rakovsky
    Christian Rakovsky was a Bulgarian socialist revolutionary, a Bolshevik politician and Soviet diplomat; he was also noted as a journalist, physician, and essayist...
    
    , Chairman of the Council of People's Commissars (1920–1923)
• 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...
    
     (1916–1922)

North America and the Caribbean

• Canada -
  • 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 Canada (1910–1936)
  • Governor-General -
    1. 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)
    2. Viscount Byng of Vimy, Governor-General of Canada (1921–1926)
  • Prime Minister -
    1. Arthur Meighen
       Arthur Meighen
       Arthur Meighen, PC, QC was a Canadian lawyer and politician. He served two terms as the ninth Prime Minister of Canada: from July 10, 1920 to December 29, 1921; and from June 29 to September 25, 1926. He was the first Prime Minister born after Confederation, and the only one to represent a riding...
       
       , Prime Minister of Canada (1920–1921)
    2. William Lyon Mackenzie King
       William Lyon Mackenzie King
       William Lyon Mackenzie King, PC, OM, CMG was the dominant Canadian political leader from the 1920s through the 1940s. He served as the tenth Prime Minister of Canada from December 29, 1921 to June 28, 1926; from September 25, 1926 to August 7, 1930; and from October 23, 1935 to November 15, 1948...
       
       , Prime Minister of Canada (1921–1926)
• Costa Rica - Julio Acosta García
  Julio Acosta García
  Julio Acosta García served as President of Costa Rica from 1920-1924.He was born in San Ramón, Alajuela, to Don Juan Vicente Acosta and Doña Jesus García....
  
  , President of Costa Rica (1920–1924)
• Cuba
  1. 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)
  2. Alfredo Zayas y Alfonso, President of Cuba (1921–1925)
• Mexico - Álvaro Obregón
  Álvaro Obregón
  General Álvaro Obregón Salido was the President of Mexico from 1920 to 1924. He was assassinated in 1928, shortly after winning election to another presidential term....
  
  , 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...
  
   (1920–1924)
• 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 - 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)
  • Warren G. Harding
    Warren G. Harding
    Warren Gamaliel Harding was the 29th President of the United States . A Republican from Ohio, Harding was an influential self-made newspaper publisher. He served in the Ohio Senate , as the 28th Lieutenant Governor of Ohio and as a U.S. Senator...
    
    , 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....
    
     (1921–1923)

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 - Epitácio 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 Gondra
     Manuel Gondra
     Manuel Gondra Pereira was President of Paraguay from November 25, 1910 to January 11, 1911 and from August 15, 1920 to October 31, 1921. He was also an author and a member of the Liberal Party....
     
     , President of Paraguay
     President of Paraguay
     The President of Paraguay is according to the Paraguayan Constitution the Chief of the Executive branch of the Government of Paraguay...
     
      (1920–1921)
  2. Eusebio Ayala
     Eusebio Ayala
     Eusebio Ayala was President of Paraguay from 7 November 1921 to 12 April 1923 and again from 15 August 1932 to 17 February 1936. He was a member of the Liberal Party. He was overthrown by Rafael Franco.- His Life :...
     
     , President of Paraguay
     President of Paraguay
     The President of Paraguay is according to the Paraguayan Constitution the Chief of the Executive branch of the Government of Paraguay...
     
      (1921–1923)
• Peru - Augusto B. Leguía y Salcedo, President of Peru (1919–1930)
• Uruguay - 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)