Borussia Dortmund is German.
Ballspielverein Borussia 09 e.V. Dortmund , commonly known as Borussia Dortmund [ boˈʁʊsi̯aː ˈdɔʁtmʊnt ] , BVB , or simply Dortmund , is a German sports club based in Dortmund , North Rhine-Westphalia ( Borussia is the Latin equivalent of Prussia ) . Dortmund plays in the Bundesliga , the top tier of the German football league system . Dortmund is one of the most successful clubs in German football history .