The star symbolizes the slaves' freedom, because in the Underground Railroad the star guided them to where they were going.
Figures of speech
"His clothes are tattered, his feet are bear, they bleed from frostbite." This is imagery. It gives us a visualization of what the slaves went through as they were trying to escape.
The figurative language that I'm using is allusion. The allusion in this poem is the Underground Railroad. It is used to make the poem stand out more.
Another figure of speech in this poem is alliteration. For example, in the poem it says "On and on in the dead of night the weary slave seeks freedom through flight." In this example, the N is being repeated, the S is being repeated, and the F is being repeated.
There are rhythm, repetition, allusion, and imagery in this poem. The rhythm and repetition are throwing in a beat, the allusion sums up what the poem is about, and the imagery show you what is happening to the slaves.
The theme, or message, of this poem is that you should always accept the help of others in times of need.