The main problem arise from the fact that Rijeka was not assigned either to Italy or to Serbia (now Yugoslavia) in the Treaty of London which defined the post-war borders in the area. It remained assigned to Austria-Hungary because - until the very end of WWI - it was assumed that the Austro-Hungarian empire would survive WWI in some form and Rijeka was to become its only seaport (Trieste was to be annexed by Italy). However, once the empire disintegrated, the status of the city became disputed. Italy based its claim on the fact that Italians comprised the largest single nationality within the city (46.9% of the total population). Croats made up most of the remainder and were a majority in the surrounding area. 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. Nevertheless, at this point the city had had for years a strong and very active Autonomist Party seeking for Rijeka a special independent status among nations as a multicultural Adriatic city. This movement even had its delegate at the Paris peace conference - Ruggero Gotthardi.