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 "Expulsion of Poles by Germany"): It began with the concept of Pan-Germanism developed in the early 19th century and culminated in the racial policy of Nazi Germany that asserted the superiority of the Aryan race.
Relevant evidence: Yes