C.C.
My daughter's 4th grade teacher showed them this video, which was made by Nick News, so is appropriate for children and doesn't contain any gory images: http://www.nick.com/videos/clip/nick-news-what-happened-t...
She sent out the link to parents so we could see what the kids saw, and continue to answer any questions the kids might have. I thought it was a very well-made video, just right for a grade school child. I hadn't stopped to think about it, but September 11, 2001 changed America as we know it, before either of my kids was born. They have never known the world any other way but at war, and constantly on alert.