1. On October 27, 1851, the first Latter-day Saint settlement was established in what is now known as Bountiful, Utah. The settlement was founded by 41 families who had been sent out by Brigham Young to establish homes in the surrounding areas. Today, Bountiful is a thriving city with a population of over 44,000.

2. On October 27, 1864, the Utah Territory officially banned slavery. This was several years before the end of the Civil War and was a significant moment in Utah's history. The territory's ban on slavery was a reflection of the beliefs held by many of the territory's residents, who opposed the practice.

3. On October 27, 1908, the first automobile race in Utah's history was held in Salt Lake City. The race was organized by the Automobile Club of Utah and was run over a 12-mile course. The winner of the race was a local driver named George Rupple, who completed the course in just under 25 minutes.

4. On October 27, 1919, the first transcontinental airmail service began in the United States. The inaugural flight took off from New York and made stops in several cities before eventually reaching San Francisco. One of the stops on the route was in Salt Lake City, making it an important moment in Utah's aviation history.

5. On October 27, 1979, the first of seven nuclear tests was conducted at the Nevada Test Site, just across the border from Utah. The tests were part of the United States' ongoing nuclear program and resulted in significant controversy and protests from residents of both Utah and Nevada. Today, the site is a National Historic Landmark and is open to visitors for tours and educational purposes.