1. Statehood Day: May 31, 1907 marked the official day that Oklahoma became the 46th state in the United States of America. This day is known as Statehood Day and is celebrated annually by Oklahomans.

2. Tornado Outbreak: On May 31, 2013, an outbreak of tornadoes struck Oklahoma, including the EF5 tornado that devastated the city of Moore. This tornado killed 24 people and caused over $2 billion in damage.

3. Oklahoma City Bombing: May 31, 1995 marked the 51st day of the trial of Timothy McVeigh, the man responsible for the Oklahoma City bombing that killed 168 people. McVeigh was ultimately found guilty and sentenced to death.

4. U.S. Air Force Base Established: On May 31, 1948, the U.S. Air Force established its first missile base in Oklahoma at Altus Air Force Base. Today, the base is home to the 97th Air Mobility Wing and is a vital part of the Air Force's global reach mission.

5. Birth of Comedian: May 31, 1968 saw the birth of comedian and actor John P. Farley in Madison, Wisconsin. Farley is best known for his work in various Adam Sandler films, as well as his role as the host of "You Bet Your Ass" on the Game Show Network.