Any Civil War buffs out there?

A teacher at my school, Ura-sensei, asked me if I would talk to his world history class about the Civil War sometime in the next few weeks. I didn't feel as though I could tactfully refuse, so now I have to talk about something way outside my realm of expertise, and I was hoping I could get some ideas of what I should do. I had originally thought I would pick some specific area (ie, life during the civil war, or civil war technology, or effects on later generations), since I only have an hour. But then I looked at the kids' world history textbook. There is a grand total of 2 pages (with pictures!) covering Westward Expansion, Lincoln, the Civil War, and a couple of vague sentences about changes in American culture. Not a single battle is named, no important players other than Lincoln are mentioned, which states were on which side was completely omitted, and the reasons for the war are pretty sparse. This means just about anything is fair game.

I would just love it if one of you could give me a suggestion (entire lesson plans accepted as well) for how to do a meaningful 50 minutes on the Civil War.