Changes

===Early 20th Century, WWI and the Great Depression===

At this cue, Teddy Roosevelt and Jon Muir are shown on stage standing in a forest. The two men are discussing the need for balance between industrial progress, and conservation of the environment. Muir is eventually able to impress upon the President that Roosevelt needs to stop the massive destruction of America's national parks. After Roosevelt says he agrees that they need to protect the country's resources, Muir says:

{{Quotation| Then start it here and now. <br> Make this valley a part of Yosemite National Park. |John Muir.}}

Following the proposal, the rock that Roosevelt and Muir had been standing on lowers into the stage. Mark Twain then comments that that "Ready or not, we were soon thrust into the hectic role of a world leader and into the war to end all war". Following this proclamation, footage of World War I is shown, including a video of the Sopwith Camel, with the caption, "Another enemy airplane falls to America's gallant ace Captain Eddie Rickenbacker.” After this, the scene changes again, this time to a parade being held in honor of Charles Lindbergh. A news report is then heard, during which the newscaster tells guests that Lindbergh successfully made a solo flight across the Atlantic Ocean aboard his plane the “Spirit of St. Louis”. As the newscast finishes, guests hear a second newsman who tells them, that on October 29, 1929, the stock market has crashed.