I was gonna say Mr Smith Goes To Washington, but I remembered I watched that movie in my AP American History class in high school. It was very uncomfortable for everyone watching it, and I can't believe that movie is that long. Ridiculous.the Dept of Science said:I started watching Birth of a Nation (1915). I felt that I should because it's considered to be one of the most important films of all time. The only problem is it's 3 hours long and incredibly racist (its basically about how the KKK will save America from the negros). I think you would need to be in a very particular mood to watch it.