Question: Whose defeat ended the anti-Polish campaign that began with the idea to unify all the German and possibly also Germanic-speaking peoples in a single nation-state known as "Großdeutschland".?
Sentence (from "Pan-Germanism"): Pan-Germanists originally sought to unify all the German and possibly also Germanic-speaking peoples in a single nation-state known as "Großdeutschland".
Relevant evidence: Yes