20th Century By ez13012 1900 Scofield mine disaster 1905 Uintah Indian Reservation is opened to white settlement 1906 open-pit copper mining begins in Bingham canyon 1WW is established. 1908 Natural bridges is Utah's first national monument. 1917 World war 1 U.S enters the war. 1918 Zion national park is Utah's first national park. 1923 The Posey War 1929 The Great Depression begins. 1932 Franklin Roosevelt is elected as president. 1934 Great drought hits Utah