PBS and History Channel are good

You can download a lot of documentary from PBS.org, like American Presents, American Experiences.

Recently, there is a good documentary about African Americans edited by Dr. Gates from Harvard (you need to buy probably). It is fantastic.

Plus, read more! Trust me, American history is amazing, the more I read and learn, the more I love this country, and the more I am confident that I can be a good mentor for my son.