It is to be noted that the poem uses metaphorical language to describe the difference between slavery and freedom. Hence, it can be concluded that the poem tells a story.
<h3>What is the textual evidence that supports the answer above?</h3>
The textual evidence that strongly supports the above assertion is the penultimate and the last line of the last stanza which reads as follows:
"for the caged bird
sings of freedom."
Hence, the poem is about the story of slavery and freedom.