1. May 17, 1954: Brown v. Board of Education
One of the most significant events in Oklahoma's history on May 17th was the landmark Supreme Court decision in Brown v. Board of Education. This decision abolished racial segregation in public schools across the country.

2. May 17, 1909: Statehood Day
On May 17th, 1909, Oklahoma officially became the 46th state in the United States of America. The occasion was marked by numerous celebrations, including a huge parade in Oklahoma City.

3. May 17, 1970: Tornado Outbreak
May 17th was the day Oklahoma experienced one of the deadliest tornado outbreaks in its history. On that day, a total of 41 tornadoes swept through the state, resulting in 57 fatalities and over 500 injuries.

4. May 17, 1930: First Sooner Football Game in Memorial Stadium
On May 17th, 1930, the first football game was played at Memorial Stadium in Norman, Oklahoma. The first game was played between the University of Oklahoma and Northwestern, with the Sooners winning 25-0.

5. May 17, 2013: Tornado Outbreak in Central Oklahoma
On May 17th, 2013, a massive tornado outbreak occurred in central Oklahoma. This series of devastating tornadoes resulted in 24 fatalities and hundreds of injuries, along with billions of dollars in damages.