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-Germanism or Pan-Germanicism (German: "Pangermanismus" or "Alldeutsche Bewegung" ; see also Pan-Germanicism) is a pan-nationalist political idea.
Relevant evidence: No