Why did this poem start with a question and end with question

Harlem
What happens to a dream deferred?
Does it dry up
like a raisin in the sun?
Or fester like a sore—
And then run?
Does it stink like rotten meat?
Or crust and sugar over—
like a syrupy sweet?

Maybe it just sags
like a heavy load.

Or does it explode?

The use of questions at the beginning and end of the poem adds a sense of ambiguity and uncertainty to the theme of deferred dreams. By starting and ending with questions, the poet emphasizes the idea that the consequences of unfulfilled dreams are not always clear or predictable. The open-ended nature of the questions leaves the reader to ponder the potential outcomes and complexities of deferred dreams.