1. On July 15, 1932, the Hoover Dam was officially dedicated by President Franklin D. Roosevelt. The dam, located on the border between Nevada and Arizona, was an engineering marvel that provided hydroelectric power to millions of people and helped transform the American West.

2. The first licensed casino in Nevada, the Northern Club in downtown Las Vegas, opened on July 15, 1931. This marked the beginning of Nevada's transformation into the gambling capital of the world.

3. On July 15, 2002, the University of Nevada, Las Vegas (UNLV) announced that it had reached a deal with Pepsi to rename its basketball arena the "Thomas & Mack Center Presented by Pepsi." The Thomas & Mack Center is one of the largest and most popular event venues in Las Vegas.

4. In 1987, Mike Tyson and Tony Tucker fought for the undisputed heavyweight championship at the Las Vegas Hilton on July 15. Tyson won the fight by unanimous decision, becoming the first heavyweight since Muhammad Ali to hold all three major titles at once.

5. The Nevada State Museum in Carson City opened its doors to the public on July 15, 1941. The museum houses exhibits on the state's geology, natural history, and cultural heritage, including displays on the state's mining industry and famous residents like Mark Twain.