When does the seventeenth episode of "The Simpsons"' twenty-first season which was renewed for by Fox aired?
American History X-cellent: "American History X-cellent" is the seventeenth episode of "The Simpsons"<nowiki>'</nowiki> twenty-first season and 458th overall. The Simpsons (season 21):  It was the first of two seasons that the show was renewed for by Fox, and also the first season of the show to air entirely in high definition.
i don't know