Mokarzel represented the Lebanon League of Progress in the Paris Peace Conference of 1919 where he advocated French tutelage over Mount Lebanon. On September 28, 1919, when the prospects of French control began to materialize, Mokarzel dispatched a fervent telegram to his New York office announcing that the French army would replace the British forces in Greater Syria and that Lebanon would come under French guardianship. In 1923, on the occasion of Al-Hoda's Silver Anniversary, Mokarzel was celebrated as a leading figure by the Maronite and the non-Maronite literary community of America, as well as by a number of American friends.