Answer:
The correct answer is "the United States".
Step-by-step explanation:
The celebrated poem "O Captain! My Captain!" by Walt Whitman, could be summarized as an extended metaphor of the assassination of American president Abraham Lincoln. It is classified as an elegy or mourning poem were the Captain represents Abraham Lincoln and the ship represents the United States. The poem prays for the Captain to rise up, as he is now dead and could not see that the trip has finished and the ship "has weather'd every rack", a metaphor of how Abraham Lincoln led United States to progress.