ngdom of the Serbs, Croats and Slovenes (later the Kingdom of Yugoslavia) claimed sovereignty based on their "irredentist" ("unredeemed") ethnic populations.
After a brief Serbian occupation, an international force of Italian, French, British and American troops occupied the city (November 1918) while its future was discussed at the Paris Peace Conference during the course of 1919.
Italy based its claim on the fact that Italians were the largest single nationality within the city, 88% of total. Croats made up most of the remainder and were also a majority in the surrounding area, including the neighbouring town of Su�ak. Andrea Ossoinack, who had been the last delegate from Fiume to the Hungarian Parliament, was admitted to the conference as a representative of Fiume, and essentially supported the Italian claims.
On 10 September 1919, the Treaty of Saint-Germain was signed declaring the Austro-Hungarian monarchy dissolved. Negotiations over the future of the city were interrupted two days later when a force of Italian nationalist irregulars led by the poet Gabriele d'Annunzio seized control of the city by force; d'Annunzio eventually established a state, the Italian Regency of Carnaro.
The resumption of Italy's premiership by the liberal Giovanni Giolitti in June 1920 signaled a hardening of official attitudes to d'Annunzio's coup. On 12 November, Italy and Yugoslavia concluded the Treaty of Rapallo, under which Rijeka was to be an independent state, the Free State of Fiume, under a regime acceptable to both. D'Annunzio's response was characteristically flamboyant and of doubtful judgment: his declaration of war against Italy invited the bombardment by Italian royal forces which led to his surrender of the city at the end of the year, after five days' resistance. Italian troops took over in January 1921. The election of an autonomist-led constituent assembly for the territory did not put an end to strife: a brief Italian nationalist
