Whitman highlights the 'singing' of different workers to unite the working class, symbolize solidarity and unity, and portray the industriousness and individuality of Americans.
Walt Whitman highlights the 'singing' of different types of workers as making up the voice of America because he wants to unite the working class by showcasing workers from various occupations. This emphasis on diverse workers symbolizes solidarity and unity among Americans, regardless of their professions. By portraying the industriousness and individuality of Americans through their work songs, Whitman allows readers to see themselves reflected in the poem.
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