American?

Part of my job description is to participate in other school's English programs when asked by my principal.  On Jan. 15 I'll be in a small town called Osan (just south of Seoul) to be one of three native speakers at an English Camp for about 50 high school students.  The director of this weekend camp sent me an email yesterday detailing the event and my responsibilities.  One thing I've been asked to do is present a 30 minute power point presentation about American culture.  To get me going on this task, the director suggested a few topics to include.  What do your people look like?  What do they eat?  This got me thinking about what exactly American culture is.  I'm really not sure.  What do we look like?  There are white Americans.  Black Americans.  Asian Americans.  Hispanic Americans.  etc. etc. etc.  What do we eat?  McDonalds?  My favorite places to eat back at home are Monterrey's and Joy of Tokyo...obviously not American.  What am I?  What makes me distinctly American?  Is it that I'm white and speak English?  In that case I could be Australian, Canadian, British, etc. 

America is such a diverse place.  "Melting Pot" was the term used in my 8th grade Social Studies class.  No matter what part of the country a Korean person is from, the same formalities are used in speech to communicate respect. In America, a person from the South says yes ma'am and yes sir.  In the North this is viewed as slightly disrespectful, or sassy (so I'm told). 

Needless to say, I'm at a loss.  I'm halfway tempted to go the route of pop culture, which is 'strictly' American.  But I'll confess I'm embarrassed to use the likes of Justin Bieber, the Miami Heat, and American Idol to represent myself. 

Any help would be greatly appreciated!