The answer to this question is going to have to be subjective. No one should or could effectively write this for you. It will be something that you will have to generate. The fundamental issue that you would have to address here is how the poet speaks of a nation that is fraught with mistake and err and one that is filled with beauty. Within this contradiction, the reader is placed and one has to understand that this is a disparity that possesses the history of any nation, but moreso America. A nation that is complete with "might and granite wonders" has to be reconciled with one that "feeds the bread of bitterness." Historically we can see this with a nation's narrative that is filled with both the promises of the Constitution and the bitterness of slavery and subjugation. There is absolute hope in the freedom of the amendments and the notion of what it means to be free, but pure horror at the measures to which voices have been silenced from its discourse. In the end, this is America and its people, filled with contradictions and complete beauty and terror. I would think that your writing or your response might poised amongst both of these realities.