The easiest (and laziest) would be to do it on any of the recent Hollywood "historical" movies out there (gangs of NY is a good example). The history channel (the dvd's have the "analysis") has done a few hollywood or history bits about the movies. Just watch and take notes. Then your presentation is done. No extra research needed.
Personally, I think this is the lame way out (having on of my degrees in history), but at least you wouldn't be butchering history with inaccuracies.