Question: Otto von Bismarck used Lückentheorie while under Prussian leadership in which empire?
Sentence (from "Otto von Bismarck"): Otto Eduard Leopold, Prince of Bismarck, Duke of Lauenburg (1 April 1815 – 30 July 1898), known as Otto von Bismarck (] ), was a conservative Prussian statesman who dominated German and European affairs from the 1860s until 1890.
Relevant evidence: No