Why does Whitman describe Americans from different social classes and professions in Song of Myself?

Whitman describes Americans from different social classes and professions in "Song of Myself" to celebrate the diversity and unity of the American people. He aims to highlight the interconnectedness and equality among individuals, emphasizing the idea of a common humanity that transcends societal divisions. By portraying a wide range of individuals in his poem, Whitman showcases the complexity and richness of American society.