I'm asking about the poem "grass" by carl sandburg ... if it has a metaphor or not? And if it has in which line can i see the metaphor?

Carl Sandburg's short poem "Grass" represents a metaphor for the disguise of history. The persona tells how histories that have taken place are sooner or later disregarded. The persona tells that the histories should not be disregarded, but be left the way it is as cited in the poem "I am the grass. Let me work." People should notice the events that took place and learn from their mistakes and be better people. The places that are mentioned in the poem are allusions. The allusions are indirect references that Carl Sandburg utilizes to exhibit the seriousness of the past events.