1. In 1937, the Oklahoma State Capitol Building was completed after four years of construction. The Capitol Building is the only one in the world with oil rig derricks on its grounds, representing the importance of the oil industry in the state.

2. In 1837, Osage County was established by the U.S. government, named after the Osage Nation who inhabited the area. Today, Osage County is the largest county in Oklahoma by land area, covering over 2,251 square miles.

3. In 2015, Oklahoma Governor Mary Fallin signed a bill into law making it illegal to perform an abortion after 20 weeks of pregnancy, with exceptions for the life and health of the mother. This law was challenged and ultimately upheld by the Oklahoma Supreme Court.

4. In 1968, the annual Azalea Festival began in Muskogee, Oklahoma, celebrating the beautiful azalea blooms that can be found throughout the city. The festival includes a parade, outdoor concerts, and carnival rides.

5. In 1909, the University of Oklahoma men's basketball team played their first ever game, defeating Kingfisher College 40-18. Today, the OU men's basketball team is one of the most successful college basketball programs in the country, with five Final Four appearances and 20 conference championships.