Countries Unchanged by the Congress of Vienna (1815)

The Congress of Vienna redrew Europe's map, but these states retained their pre-war boundaries and sovereignty:

German States (Confederation of the Rhine survivors)

• Baden
• Bavaria
• Hesse-Cassel (Hesse-Kassel)
• Hesse-Darmstadt
• Mecklenburg-Schwerin
• Mecklenburg-Strelitz
• Oldenburg
• Saxony (kingdom retained, lost territory to Prussia)
• Württemberg

Scandinavia

• Denmark (lost Norway to Sweden, but Danish territory unchanged)
• Sweden (gained Norway, but Swedish borders unchanged)

Western & Southern Europe

• Great Britain (no territorial changes in Europe)
• Portugal
• Spain
• Sardinia (Piedmont-Sardinia, later core of Italy)

Eastern & Central Europe

• Russia (gained Poland, but Russian borders unchanged)
• Prussia (gained territory, but Prussian core unchanged)
• Ottoman Empire (not a participant; borders frozen)
• Switzerland (neutrality recognized; borders unchanged)
• Liechtenstein
• Hanover (in personal union with UK)

Nuance

"Unchanged" means sovereign recognition and core territory intact. Many gained/lost small border strips or joined new confederations (German Confederation). The big losers: France (reduced to 1790 borders), Poland (partitioned), Holy Roman Empire (dissolved 1806).