When I was so much younger, my first or second grade teacher taught us that the United States owned the Panama Canal. She failed to mention we only had a lease on the property for so many years. I'm sure she didn't know. I learned many years ago that was incorrect information. What this film taught me was she was wrong that they used canals because the Atlantic and Pacific oceans were at different levels. Now I know it was because of the lake system they built so they didn't have to dig 500 feet. You learn something new every day or so I guess.