←  Holy Roman Empire
|
 German Confederation →  North German Confederation → German Empire →
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Treaties concluded by the 
Duchy of Oldenburg (or the Grand Duchy of Oldenburg) (1774–1918).
| ← Holy Roman Empire
|
German Confederation → North German Confederation → German Empire →
|
Treaties concluded by the Duchy of Oldenburg (or the Grand Duchy of Oldenburg) (1774–1918).