1. In 1928, Route 66 was officially established in Oklahoma, running from the Texas state line to the Missouri state line. The iconic highway, also known as the "Main Street of America," played a significant role in the country's transportation and tourism history.

2. On June 23, 1945, the deadliest tornado on record in Oklahoma hit the town of Blackwell. The EF5 tornado, with winds estimated at 261–318 mph, killed 20 people and caused extensive damage to the town and its surroundings.

3. In 1993, a tornado outbreak hit several states, including Oklahoma, resulting in 11 deaths and extensive damage. The outbreak is known as the "Storm of the Century" and is considered one of the most significant weather events in U.S. history.

4. June 23, 1979, marks the opening of the first tribal-owned casino in Oklahoma, the Bingo Palace in Ada. The establishment paved the way for the state's current thriving casino industry, with dozens of tribal casinos operating throughout the state.

5. On June 23, 2005, Oklahoma City hosted a protest by Westboro Baptist Church, known for its controversial and offensive messages, at the memorial service for Medal of Honor recipient Ernest Childers. The protest sparked public outrage and resulted in a bill being passed in Oklahoma to restrict protests at military funerals.