Many states require an in-depth study of State History in high school. This is usually a one-semester course.
For home schoolers, the course can be comprised of many field trips throughout the state plus a State Notebook. It is a good idea to begin the notebook in the freshman year and add to it as you continue through high school. Students can add information to the notebook from family vacations, field trips, festivals, competitions, etc.
These are some of the requirements we had for our children’s notebooks.
To find the info needed have your child go your state's historical society, the Secretary of State web site of your state or search '[state name] history" on the web.
Check these out
http://www.classbrain.com
http://homeschooling.about.com/cs/unitssubjgeog/a/susindex.htm
http://www.50states.com/
http://www.theus50.com