1. Oklahoma Territory was officially created on May 26, 1890, with the signing of the Organic Act by President Benjamin Harrison. This act combined the western half of Indian Territory (present-day Oklahoma) with Oklahoma Territory and created a single territory that would eventually become the state of Oklahoma.

2. On May 26, 1938, the city of Moore, Oklahoma was hit by a tornado with winds up to 175 mph. The tornado caused significant damage to homes and businesses and killed six people. This was just one of many tornadoes that have struck Oklahoma in its history due to its location in Tornado Alley.

3. The Oklahoma City Zoo opened its doors on May 26, 1902. The zoo initially had just a few animals, including a grizzly bear, two deer, and a few birds, but it has since grown to house over 1,900 animals representing 512 species from around the world.

4. The first Girl Scout troop in Oklahoma was formed on May 26, 1912, in Shawnee. The troop consisted of 18 girls and was originally led by a local schoolteacher. Today, there are over 15,000 Girl Scouts across the state.

5. On May 26, 2019, the Oklahoma City Thunder's season came to an end with a loss to the Portland Trail Blazers in the NBA Playoffs. Despite the loss, the season was noteworthy for the impressive play of Thunder guard Russell Westbrook, who became the second player in NBA history to average a triple-double for three consecutive seasons.