The multi-ethnic Austro-Hungarian Empire (1867–1918) faced rising nationalist demands from its dozen+ recognized peoples (Germans, Hungarians, Czechs, Slovaks, Poles, Ruthenians/Ukrainians, Romanians, Croats, Serbs, Slovenes, Italians, Bosniaks). Core demands included:
Right to use own language in schools, courts, administration; preserve customs, religion, associations.
Fair suffrage (universal male suffrage introduced 1907 in Austrian half), proportional representation in parliament (Reichsrat), ministerial posts.
Access to civil service, education, investment; end to discriminatory hiring/taxation; infrastructure development in neglected regions (Galicia, Bukovina, Dalmatia).
Czechs: "Bohemian Crownlands" autonomy. South Slavs: Trialism (third kingdom). Poles: Galician autonomy (achieved 1867). Romanians: Transylvanian self-rule.
Vienna's refusal to restructure as a true federation—and Hungarian intransigence in its half—fueled radicalization. WWI provided the catalyst; the empire collapsed in 1918, succeeded by nation-states (Czechoslovakia, Yugoslavia, etc.) and enlarged Romania, Italy, Poland.