Anyone from Chicago?

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Hi. I'm going to make a presentation about Chicago on next Friday as an English class project. The thing is supposed to be limited to three minutes (time constraints), and honestly that's absolutely not enough time for a proper presentation.

Since I'm just going to have few time for the presentation, I would like to present only the most representative things in Chicago, so I was wondering if any of you could help me with your inherit local knowledge. My English teacher is from Rockford, I believe, so she's already giving us a heads up.

We are going to present:

1- Geographical location.
2- Historical background.
3- Main attractions.
4- Representative music and food. (It would be best if it was something typical or originated in the city.)
5- Famous people.

So we are currently thinking of:
Wrigley Field
Sears Tower
Wind Track
Navy Pier

Music: Jazz & Blues.
Typical food: Hot dogs, Pizza.

Famous people: Capone, Frank Sinatra.

The theme of the presentation will be the 20'ies, so a friend will dress like a flapper while I'll do my best to resemble a gangster (My modern dark striped blue suit, black tie and hat.)

So what do you think? Any suggestion? Interesting facts that you want to share?

PS: I know, trying to present a city in less than three minutes is ludicrous at best.