Videos From Khan Academy
http://www.khanacademy.org/video/us-history-overview-1--jamestown-to-the-civil-war?playlist=History
http://www.khanacademy.org/video/appomattox-court-house-and-lincoln-s-assassination?playlist=History
http://www.khanacademy.org/video/us-history-overview-2---reconstruction-to-the-great-depression?playlist=History
http://www.khanacademy.org/video/us-history-overview-3---wwii-to-vietnam?playlist=History