The Fresh Prince Of Bel-Air: The Ethnic Tip
Series 1, episode 17 from 1991.
Will does very badly in his history exam and blames it on the fact they only cover white people.
So, they decide to study black history and Vivian is hired as the professor.
He still fails.
It concludes with a quote from Malcolm X.
The episode is one with a political agenda.
I prefer the ones that stick to the basic comedy.
Movie pages here.