Belgium: Albert I (King)
Brazil: Venceslau Brás (President)
Canada: Robert Borden (Prime Minister)
China: Yuan Shikai (President)
France: Raymond Poincaré (President)
Germany: Wilhelm II (Emperor)
Italy: Vittorio Emanuele III (King)
Japan: Yoshihito (Emperor)
Mexico: Venustiano Carranza (President)
Peru: Guillermo Billinghurst (President)
Portugal: Manuel II (King)
Russia: Nicholas II (Tsar)
Serbia: Peter I (King)
South Africa: Louis Botha (Prime Minister)
Spain: Alfonso XIII (King)
Sweden: Gustav V (King)
Turkey: Mehmed V (Sultan)
United Kingdom: George V (King)
United States: Woodrow Wilson (President)