1. On April 20, 1890, the LDS Church officially renounced polygamy. The 1890 Manifesto was a significant turning point in Utah's history and had a major impact on the state's politics and social dynamics.

2. In 1920, Utah ratified the 19th Amendment to the US Constitution, granting women the right to vote. The state was the 36th and final state to ratify the amendment, which made it officially part of the Constitution.

3. On April 20, 1914, the Ludlow Massacre occurred in southern Colorado, which had a significant impact on Utah's mining communities. Many of the miners in Colorado were immigrants from Utah, and the massacre led to increased labor unrest and violence in the state's mining industry.

4. In 1869, the first transcontinental railroad was completed at Promontory Summit, Utah. The historic event marked a major milestone in the westward expansion of the United States and had a significant impact on Utah's economy and population growth.

5. On April 20, 2007, a mass shooting occurred at Virginia Tech in Blacksburg, Virginia. The tragedy had a profound impact on the nation and galvanized efforts to improve campus safety and mental health services. In Utah, it led to increased attention on how to prevent similar incidents on college campuses.