1. Land Rush of 1891: On May 19, 1891, the fourth and final land run in Oklahoma Territory occurred. This land run opened up the western part of the territory, which included the towns of Enid and Woodward.

2. Centennial Celebration: May 19, 2007 marked the 100th anniversary of Oklahoma statehood. The state hosted events across the state, including a parade in downtown Oklahoma City and a tree planting ceremony.

3. Tornado Outbreak: On May 19, 2013, a deadly tornado outbreak occurred in central Oklahoma, including the cities of Newcastle, Moore, and Shawnee. The outbreak produced several tornadoes, including one that hit Moore, killing 24 people and causing more than $2 billion in damage.

4. Oil Boom: May 19, 1918, marked the discovery of the first productive oil well in the Seminole oil field. This discovery led to a major oil boom in Oklahoma that greatly contributed to the state's economy.

5. Education Funding: May 19, 2018, marked the beginning of a teacher walkout in Oklahoma. Teachers across the state walked out of their classrooms and held rallies at the State Capitol to demand more funding for education. The walkout lasted for two weeks and resulted in the state legislature passing a measure to increase teacher pay and education funding.