During the United States occupation of Haiti, Auguste Nemours wrote his Histoire Militaire.

[2] He also was part of the unpopular occupation government of Louis Borno, serving as Conseiller d'Etat from 1918 to 1922, Secretary and President du Conseil d'Etat from 1922 to 1925, and Minister Plenipotentiary to Paris from 1926 to 1930.

He was the Haitian delegate to the 7th (1926), 9th (1928) and 16th (1935) Ordinary Session of the Assembly of the League of Nations, held in Geneva, Switzerland.

[3][4][5] Speaking at the League, Nemours made a widely-reproduced statement in response to the invasion of Ethiopia by Mussolini's fascist troops: Craignez d'être un jour l'Ethiopie de quelqu'un.Fear to ever become someone's Ethiopia.He continued to play a prominent role in Haitian politics, as Senator of the Republic in 1938 and Secretary of State of Interior in 1940.

C. L. R. James met Nemours in Paris when he was writing The Black Jacobins (1938).