Found this terrific educational resource and can see many ways it can be used. The main homepage does have information regarding the sale of some items.
Take a look at the 10 minute movie that discusses the geographic history of the United States. You can view the film in its entirety or see the 3 individual parts based on years.
Then, share the timeline. It appears at the bottom and an arrow moves along with the video to show the passage of time. What
is nice with this timeline is that there is information on Presidents, states, culture, and society. What would make this resource even better would be direct links to information sources on the various topics