1. The Golden Spike Ceremony: On June 16, 1869, the final spike was driven into the ground, completing the First Transcontinental Railroad and linking the eastern and western coasts of the United States. The event took place at Promontory Summit, Utah, and is now known as the Golden Spike Ceremony.

2. Utah Statehood: On June 16, 1896, President Grover Cleveland signed a proclamation making Utah the 45th state in the Union. Utah had been a U.S. territory since 1848 and had applied for statehood several times before being admitted.

3. Boilermaker's Strike: On June 16, 1952, more than 4,000 workers at the Geneva Steel plant in Orem, Utah, went on strike. The workers, mostly boilermakers and other skilled tradespeople, were protesting low wages and poor working conditions. The strike lasted for 77 days and ended with a new contract that improved wages and benefits.

4. Hill Air Force Base: On June 16, 1941, construction began on the Hill Air Force Base near Ogden, Utah. The base was initially used to train pilots for World War II but has since become a major center for aircraft maintenance and repair. It is now the state's largest single employer, with more than 23,000 people working on the base.

5. Salt Lake City Library Fire: On June 16, 1985, a fire broke out at the Salt Lake City Public Library, destroying much of the building and its contents. The fire started in the attic of the nearly 100-year-old building, which had been undergoing renovations at the time. Despite the damage, the library was rebuilt and reopened in 1991, with many of the original features restored.