As a Canadian, I believe it’s not just an American problem. It’s arguably becoming a global problem. Dr. Hallowell has written several ADD books including Delivered From Distraction is doing some ADD teleclasses with Dr. John Ratey and is a good speaker. Here’s some notes from his talk in Seattle a while back.
I won’t be able to watch it but if someone does please give a summary of what he says in the comment section please.