Thanks to Richard Byrne and his blog site Free Technology for Teachers, this site looks pretty interesting and pretty useful. I have not tested it out, but if you are studying anything about the beginning of our country's history and how we got to our present day state and alignment, this site might be pretty useful and interesting for both you and our students. You can look at what our country looked like at any point in our country's history and see what happened to have us take that certain territory. Give it a try!
Manifest Destiny blog post by Richard Byrne click here