Final answer:
Walt Whitman most likely uses this structure to present a poem with a natural, conversational rhythm and reflect a lyrical style using stressed and unstressed syllables.
Step-by-step explanation:
Walt Whitman most likely uses this structure for his poem to
present a poem with a natural, conversational rhythm. Through the repetition of the phrase 'singing his' and the use of enjambment, the poem mimics the natural flow of speech. This gives the poem a sense of authenticity and captures the diversity and vitality of America's working class. Whitman's use of stressed and unstressed syllables also reflects a
lyrical style, adding musicality to the poem.
Learn more about Purpose and structure of Walt Whitman's poem 'I Hear America Singing'