The Federation of Danubian Nations, more commonly known as Danubian Federation or FDN is a federal state in Central and South Europe. The state was founded by Hungary, Bosnia, Serbia and Romania in 1879 after the Balkan War and the Great Revolution of Nations. The state is divided into several republics: to the Hungarian, Slovakian, Czech, Austrian, Romanian, Croatian, Slovenian, Bosnian, Serbian and the Albanian.