The study of the history in riding in America is a good place to connect general US history with something kids love. Check out my web site http://www.ushorsemanship.net . Also I have a blog about horsemanship history: http://www.ushorsemanship.blogspot.com/
Also connected is my blog about teaching riding http://www.theridinginstructor.blogspot.com/
If you have an interest in these topics and are willing to take a look, I'd love some feedback.
Also if you'd like to take a look at my business site for Fox School of Horsemanship in N. AZ it would be great. The URL is http://www.foxschoolofhorsemanship.com