The title literally means an assignment for english B. The deeper meaning is how he is frustrated with the way he's treated and how people should not be separated just because of their race.
The poem is about a Black young man who is confused about the visuals of life in comparison to other races when he is assigned an english paper. As it develops he discovers what it means to be an American.
American is one of the most important words in the poem because it shows how all people are connected. Another word would be the authors use of you/me because it shows how he does not use the word we and it shows how he thinks they are different.
The attitude is mainly frustrated because of the way he is being realistic towards the way he and others of his race are treated.
there is no shift in this poem, he stays frustrated and realistic throughout the poem although by the end he is more open to his ideas and beliefs.
the message that the poem reveals is we are all equals due to race, and our being different makes us American.