In the poem Chicago by Carl Sandburg who is bragging and laughing in poem?

In Carl Sandburg's "Chicago," the city itself is the one bragging and laughing.

The poem is written in the persona of Chicago, a powerful and vibrant city that embraces its flaws and celebrates its strengths. It boasts about its "big shoulders" and "tough hide," its "laughter," its "wickedness," and its "glory." This personification creates a sense of the city's proud, energetic, and unapologetic nature.

The poem doesn't specifically name a person who's bragging, but rather presents Chicago as a character that embodies these qualities.