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Bismarck is the capital city of North Dakota.
In "Simpson and Delilah," while the family is watching a television quiz game show, one question is "The capital of North Dakota is named after what German ruler?", with Homer thinking it is "Hitler." Patty and Selma correctly answer "Bismarck" as the city is named after German chancellor Otto von Bismarck.
While in The Prodigy Barn toy store, Bart was playing a video game that involved blasting the capital cities of every state. He was having fun until he realized it was an educational game and threw the controller at the television screen, exclaiming, "That'll teach you to teach me!".