When should historians use Great War, World War One, Entente powers, or Allies?
Short answerUse the label appropriate to the period and coalition: Great War is closer to contemporary usage, World War One is later, and Allied terminology solidified with formal wartime cooperation.
Notes'Great War' belongs close to the 1914-1919 conflict, while 'World War One' became normal only after a second global war made numbering useful. 'Allies' also depends on the stage of coalition formation, so writers should match terminology to the actors and date under discussion.