1. The completion of the First Transcontinental Railroad: On May 10, 1869, the final spike was driven into the ground at Promontory Summit, Utah, officially completing the First Transcontinental Railroad. This groundbreaking achievement revolutionized transportation in the United States, allowing for faster and more efficient movement of people and goods across the country.

2. The Utah Territory becomes a state: On May 10, 1896, Utah was granted statehood, becoming the 45th state in the United States. This decision culminated decades of struggle and controversy over issues such as Mormonism, polygamy, and statehood.

3. The Kennecott Copper Mine disaster: On May 10, 1958, a massive landslide occurred at the Kennecott Copper Mine in Bingham Canyon, Utah, causing significant damage to the mine and surrounding areas. Despite the scale of the disaster, no one was injured or killed.

4. May 10 is recognized as Clean Air Day in Utah: In 2018, Governor Gary Herbert declared May 10 as Clean Air Day in Utah, encouraging citizens to take action to reduce air pollution and improve air quality. This recognition highlights the importance of addressing the issue of air pollution in the state.

5. The dedication of the LDS Oquirrh Mountain Utah Temple: On May 10, 2009, the Oquirrh Mountain Utah Temple of The Church of Jesus Christ of Latter-day Saints was dedicated in South Jordan, Utah. The temple is one of the largest in the world, with a total floor area of 60,000 square feet, and serves as a center of worship for members of the LDS Church in the region.