Final answer:
In Carl Sandburg's poem 'Grass', the action shifts when the poem moves from recalling battlefields to the present day. Personification is used by giving the grass a voice, indicating the poem's themes of nature's power to conceal the past and the futility of war. The tone is both stark and reflective, while the themes suggest nature's indifference and the cyclical nature of life and death.
Step-by-step explanation:
The poem 'Grass' by Carl Sandburg is steeped in themes of memory, death, nature's indifference, and the transient nature of human conflicts. There is a crucial shift in the poem when the focus moves from the historical battles to modern day, where passengers on a train unknowingly traverse fields that were once battlefield domains. These battlefields have been covered by grass, signifying the passage of time and nature's reclaiming of the land.
The poem uses personification as it gives the grass a voice and a sense of purpose; it is the grass that 'covers all' and 'works' to erase the scars of war. As for the tone, Sandburg starts with a stark, blunt tone as he lists famous battlefields, but shifts to a more reflective and almost peaceful tone as he describes the grass doing its work over time.
Possible themes include the cyclical nature of life and death, the futility and anonymity of war, and the enduring power of nature to heal and conceal the traces of human strife. The author seems to be saying that despite the horrors and significance of historical events, nature eventually erases these marks, and life continues as if they had never happened. The grass is an emblem of not just nature's resilience but also of its incapacity to remember or honor the past in the way humans do.