After the Great War, there was a proposal for the League of Nations to accept Esperanto as their working language, following a report by
Nitobe Inazō, an official delegate of League of Nations during the 13th World Congress of Esperanto in Prague. Ten delegates accepted the proposal with only one voice against, the French delegate,
Gabriel Hanotaux. Hanotaux did not like how the French language was losing its position as the international language and saw Esperanto as a threat, effectively wielding his veto power to block the decision. However, two years later, the League recommended that its member states include Esperanto in their educational curricula. For this reason, many people see the 1920s as the heyday of the Esperanto movement.
Anarchism as a political movement was very supportive during this time of
anationalism as well as of the Esperanto language.