For what reason might edgar allan poe have included “the haunted palace” in his story about the house of usher?

it is a story parallel to what is happening in the usher house.
it is a way for the narrator to usher recover from his illness.
it is a welcome diversion from the seriousness of the story.
it is a vehicle through which usher shows his dramatic abilities.

The correct answer is that it is a story parallel to what is happening in the Usher house. The poem was actually written prior to the story, but because their plots are so similar, he decided to include the poem in the story afterwards. Both the poem and the story deal with a demented mind, a person who is slowly losing their wits and becoming more and more crazy by the second. So it was only appropriate he should introduce it into his story as well.

The answer to that would be prussia which would later be germany