1847 After 17 months of travel, Brigham Young leads 148 Mormon pioneers into Salt Lake Valley, resulting in the establishment of Salt Lake City. Celebrations of this event include the Pioneer Day Utah state holiday and the Days of '47 Parade.
1848 Mexican-American War: Mexico ratifies the Treaty of Guadalupe Hidalgo thus ending the war and ceding California, Nevada, Utah and parts of four other modern-day U.S. states to the United States for $15 million USD.
1863 Indian Wars: Chief Pocatello of the Shoshone tribe signs the Treaty of Box Elder, agreeing to stop the harassment of emigrant trails in southern Idaho and northern Utah.
1869 The First Transcontinental Railroad, linking the eastern and western United States, is completed at Promontory Summit, Utah (not Promontory Point, Utah) with the golden spike.
1870 Women gain the right to vote in the Utah Territory.
1896 Utah is admitted as the 45th U.S. state.
1933 Prohibition in the United States ends: Utah becomes the 36th U.S. state to ratify the Twenty-first Amendment to the United States Constitution, thus establishing the required 75% of states needed to enact the amendment (this overturned the 18th Amendment which had made the manufacture, sale, or transportation of alcohol illegal in the United States).
1935 Sir Malcolm Campbell reaches a speed of 304.331 miles per hour on the Bonneville Salt Flats in Utah, becoming the first person to drive an automobile over 300 mph
1968 Nerve gas accident at Skull Valley, Utah.
1971 Capitol Reef National Park is established in Utah.
1977 Convicted murderer Gary Gilmore is executed by a firing squad in Utah, ending a ten-year moratorium on Capital punishment in the United States.