The Four Successor States of Austria-Hungary

The Austro-Hungarian Empire (1867–1918) dissolved at the end of World War I. Its territory was reorganized into **four primary sovereign nations** (plus territory ceded to others):

1. Republic of Austria — German-speaking core (Vienna).
2. Hungarian Democratic Republic → Kingdom of Hungary (1920) — Magyar core (Budapest), lost 72% of pre-war land.
3. Czechoslovakia — Czechs + Slovaks + Sudeten Germans + Ruthenians (Prague). Split peacefully 1993 → Czech Republic & Slovakia.
4. Kingdom of Serbs, Croats, and Slovenes (1918) → Yugoslavia (1929) — South Slav union (Belgrade). Dissolved 1990s → Slovenia, Croatia, Bosnia, Serbia, Montenegro, North Macedonia, Kosovo.

Major Territorial Transfers to Other States

• Italy: South Tyrol, Trentino, Trieste, Istria, Gorizia (Treaty of Saint-Germain).
• Romania: Transylvania, Banat, Bukovina (Treaty of Trianon).
• Poland: Galicia (West) — already Polish after 1918 war.
• Ukraine (then USSR): Eastern Galicia, Carpathian Ruthenia.

The "Four Nations" formulation reflects the **Versailles/Trianon settlement's new sovereign entities** carved from the Dual Monarchy's heartland.