The most likely reason the author uses the word “sing” in the title of the poem is: 2. To Show that the speaker view himself as a legitimate voice in America.
<h3>The Theme of the Poem</h3>
In the poem, "I, Too, Sing America" Langston Hughes brought attention to the discrimination faced by the black people in America.
Just as singing can be regarded as a legitimate way of expressing oneself, the poet regarded himself as a legitimate voice that should also be heard in America.
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I'm pretty sure it's they both focus on listed aspects of the authors life.
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All of them are met when ur in a relation