1. On May 30, 1868, the Transcontinental Railroad was completed in Utah, connecting the eastern and western coasts of the United States for the first time. The last spike was driven in Promontory Summit, Utah, marking the end of a six-year project that revolutionized transportation and commerce in the country.

2. In 1913, the LDS Church completed the construction of the Salt Lake Temple, one of the most iconic buildings in Utah. The temple took 40 years to build and stands as a symbol of the church's commitment to its faith and heritage.

3. On May 30, 1924, the University of Utah awarded its first PhD degree to a female student, Rose Marie Reid. Reid went on to become a successful entrepreneur, revolutionizing the swimwear industry with her designs.

4. In 1974, the Salt Palace Convention Center was opened in downtown Salt Lake City, hosting its first event, the National Square Dance Convention. The center has since hosted numerous conventions, expos, concerts, and sporting events, boosting the city's economy and cultural offerings.

5. In 1993, the state of Utah passed the Utah Indoor Clean Air Act, becoming the first state in the nation to regulate smoking in public places. The act aimed to protect nonsmokers from the harmful effects of secondhand smoke and has served as a model for similar laws in other states.