| Quote #4
Here, Chicago seems to be in a never-ending cycle of "building, breaking, rebuilding." This is how the city (indeed, any city) grows. There is as much destruction as there is construction. This is really important to the speaker: the life of a city is constantly moving, moving, moving forward. And remember, this poem is written in the early twentieth-century, when the entire nation was industrializing, not just Chicago. Everywhere is building, breaking, rebuilding.
| Quote #5
Laughing even as an ignorant fighter laughs who has never lost a battle,
Finally, Chicago is portrayed as a laughing, burly, brawling, strong young man. Chicago may be filled with wickedness, but the speaker locates it as a hub of America. It's right in the middle of the country, and it's more vibrant, bustling, and fierce than any other city. Take that, New York, Boston, and/or San Fran!