1. Oklahoma becomes a state
June 30, 1906, marks a historic moment in Oklahoma's history as it officially became the 46th state of the United States. It was previously known as the Oklahoma Territory until it was granted statehood.

2. The first commercial oil well was drilled
On June 30, 1896, the first commercial oil well in Oklahoma was drilled in Bartlesville. It led to a boom in the oil industry in Oklahoma and transformed the state's economy.

3. The deadly Wilburton Trestle Accident
On June 30, 1975, a train carrying hazardous chemicals derailed on a trestle in Wilburton, Oklahoma, resulting in a massive explosion that killed three people and injured dozens more. The accident remains one of the deadliest train accidents in Oklahoma's history.

4. A record heat wave hits Oklahoma
On June 30, 1994, Oklahoma experienced a record-breaking heat wave with temperatures soaring up to 120°F. It was considered as one of the worst natural disasters in the state's history, leading to several deaths and causing widespread damage.

5. The founding of Langston University
On June 30, 1897, a group of African American activists founded the Colored Agricultural and Normal University in Langston, Oklahoma. The school eventually became Langston University, one of the most significant historically black universities in the United States. Today, the university is home to over 2,000 students and offers various undergraduate and graduate programs.