Final answer:
Langston Hughes is the writer who used classic blackface stereotypes in his poem 'Chieftain Iffucan of Azcan' to critique racist portrayals of African-Americans in mainstream media and entertainment.
Step-by-step explanation:
The writer's poem about 'Chieftain Iffucan of Azcan' that makes use of classic blackface stereotypes is Langston Hughes. In his poem, Hughes satirizes and critiques the racist portrayals of African-Americans in mainstream media and entertainment during his time. He uses irony and humor to highlight the absurdity and harm caused by these stereotypes. By employing these literary devices, Hughes confronts societal prejudices, urging reflection on the damaging effects of racial stereotypes prevalent in the media landscape of his time.