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He has lectured and spoken publicly at several World Congresses of Esperanto and in 2000 he directed the theme of the 85th World Congress of Esperanto in Tel-Aviv.
He gave the opening speech during the 1927 World Congress of Esperanto in Danzig, and also spoke during an instructional session during the 1934 Congress.
Compare the Esperanto forms with Serbo-Croatian Vašington, Meksiko, and Gvatemala. Likewise, cunamo, from Japanese tsunami, is similar to Czech and Latvian cunami. Other spelling differences appear when Esperanto spelling is based on the pronunciation of English names which have undergone the Great Vowel Shift, as in Brajtono for Brighton, which housed the 1989 World Congress of Esperanto.
According to the Enciklopedio de Esperanto, Mayor learned Esperanto in 1907, and gave a historic speech against Esperanto reformists at the World Congress of Esperanto held at Cambridge.
From 1928 until 1930 he was publisher of the Hispana Esperanto-Gazeto. Mangada represented the Spanish government at five World Congresses of Esperanto.
Esperanto is not the primary language of any geographic region, outside of temporary gatherings (such as conventions like the World Congress of Esperanto) and isolated offices (such as the World Esperanto Association's central office in Rotterdam).
During the World Congress of Esperanto of 1969, which was held in Helsinki shortly before his death, he served as the rector of the so-called Internacia Kongresa Universitato ("International Congressual University"), and coordinated the specialistic lectures in Esperanto given by various academicians to the congressists.
The Declaration of Boulogne (Bulonja Deklaracio) was a document written by L. L. Zamenhof and endorsed by the attendees of the first world congress of Esperanto in Boulogne-sur-Mer, France in 1905.