1. Tornado Outbreak of 2013: On June 1, 2013, a series of deadly tornadoes struck central Oklahoma, leaving 24 dead and causing extensive damage to the region. The most powerful tornado was an EF5 that hit the suburb of Moore, destroying nearly 1,400 homes and claiming the lives of 7 children at an elementary school.

2. Land Run of 1890: On June 1, 1890, the Unassigned Lands in Oklahoma were opened for settlement, as part of the Land Run that saw thousands of settlers claim their own plot of land. This event marked the end of the Indian Territory and the beginning of the Oklahoma Territory.

3. Otoe-Missouria Tribe Recognition: On June 1, 1983, the Otoe-Missouria Tribe of Oklahoma was officially recognized by the federal government, granting them certain legal rights and protections. The tribe had been previously unrecognized and struggled to maintain their cultural traditions and way of life.

4. Tulsa Race Massacre: On June 1, 1921, the Tulsa Race Massacre began when a young African American man was accused of assaulting a white woman, sparking a race riot that left an estimated 300 black residents dead and thousands more displaced. The event remains one of the worst incidents of racial violence in American history.

5. Statehood Day: June 1 is celebrated as Statehood Day in Oklahoma, commemorating the day in 1907 when Oklahoma became the 46th state to join the United States. The event is marked by various celebrations and events throughout the state.