Countries Formed from the Austro-Hungarian Empire

The dissolution of Austria-Hungary (1918) after World War I redrew the map of Central Europe. The following independent nations emerged wholly or partially from its territory:

Successor States (Wholly or Largely from Empire)

1. Austria — Core German-speaking rump state (First Republic)
2. Hungary — Reduced to ~⅓ pre-war territory (Treaty of Trianon)
3. Czechoslovakia → now Czechia & Slovakia (split 1993)
4. Yugoslavia (Kingdom of Serbs, Croats, Slovenes) → now Slovenia, Croatia, Bosnia & Herzegovina (plus Serbia, Montenegro, North Macedonia, Kosovo — partially from empire)
5. Poland — Regained independence; acquired Galicia (west) from Austria
6. Romania — Gained Transylvania, Bukovina, Banat
7. Italy — Annexed South Tyrol, Trieste, Istria, Gorizia (Treaty of Saint-Germain)

Territorial Transfers (Not New Countries)

• Ukraine — Gained eastern Galicia, Carpathian Ruthenia (briefly, then USSR)
• Serbia — Pre-existing kingdom; expanded into Vojvodina, Bosnia
• Montenegro — Pre-existing; merged into Yugoslavia

Key Treaties

• Treaty of Saint-Germain (1919) — with Austria
• Treaty of Trianon (1920) — with Hungary
• Treaty of Versailles (1919) — recognized new states

Ethnic Complexity

The empire contained 11+ major ethnic groups (Germans, Hungarians, Czechs, Slovaks, Poles, Ukrainians, Romanians, Croats, Serbs, Slovenes, Italians). New borders rarely matched ethnic lines perfectly—creating minorities issues that fueled WWII and 1990s Yugoslav wars.

Today's sovereign states with territory from Austria-Hungary: Austria, Hungary, Czechia, Slovakia, Slovenia, Croatia, Bosnia & Herzegovina, Poland, Romania, Italy, Ukraine, Serbia, Montenegro. (13 total)