I want to know the answer to the following question:
Following the unification of Germany, who maintained great authority in international affairs for two decades?
All the background I'm provided with is that "German conquest of France and the unification of Germany upset the European balance of power, that had existed since the Congress of Vienna in 1815 and Otto von Bismarck maintained great authority in international affairs for two decades.". Is that enough to answer the question?
Answer: yes