1. May 1, 1847, marked the day that the first group of Mormon pioneers entered the Salt Lake Valley. Led by Brigham Young, this group had spent over a year traveling from Nauvoo, Illinois, to establish a new settlement in the West. The date is now celebrated in Utah as Pioneer Day.

2. May 1, 1896, was the day that Utah became the 45th state in the United States. After years of controversy over the Mormon Church's teachings and practices, Utah was granted statehood following the adoption of a new state constitution that had removed most of the church's political influence.

3. May 1, 1900, was the day that the first electric trolley system in Utah began operations in Salt Lake City. The system operated for over 40 years, providing residents with a cheap and efficient means of transportation.

4. On May 1, 1917, the United States entered World War I. Utah played a significant role in the war effort, with over 4,000 residents serving in the military and the state's mining industry providing vital resources for the Allied powers.

5. May 1, 1983, was the day that the Church of Jesus Christ of Latter-day Saints dedicated the newly-constructed Salt Lake Temple, the largest Mormon temple in the world. The temple took over 40 years to build and is considered a symbol of the state's unique history and culture.