1. On May 4, 1886, Oklahoma Territory was officially established by an act of Congress. The territory, which encompassed present-day Oklahoma and parts of surrounding states, was created to allow for the resettlement of Native American tribes and to open up land for non-Native settlement.

2. The first recorded tornado on May 4 in Oklahoma occurred in 1930. The storm reportedly caused significant damage, but there were no fatalities.

3. May 4, 1970, marks the day that four students were killed and nine others injured when Ohio National Guardsmen opened fire on protesters at Kent State University. This event had a significant impact on the anti-war movement and on American culture as a whole.

4. In 2004, a massive dust storm known as the "Oklahoma City Haboob" struck the city on May 4. The storm, which was caused by a combination of drought, strong winds, and human activity, caused widespread visibility issues and property damage.

5. On May 4, 2007, an EF5 tornado struck the town of Greensburg, Kansas, which is located just across the border from Oklahoma. The tornado destroyed 95 percent of the town and killed 11 people. In the years since, Greensburg has become known for its commitment to sustainability and green living, as the town was rebuilt with a focus on energy efficiency and renewable resources.