1. In 1915, the Oklahoma Supreme Court overturned the infamous Green Corn Rebellion convictions, which had resulted in the execution of three men and the imprisonment of dozens of others. The rebellion, led by socialist and anti-war activists, had protested the military draft and other government policies.

2. On March 26, 1931, the Tulsa Tribune published an editorial urging white Tulsa residents to "nail a nigger's hide to the fence" in reference to allegations of a black man assaulting a white woman. This editorial sparked the Tulsa Race Riot, one of the deadliest and most destructive incidents of racial violence in American history.

3. The Oklahoma City bombing occurred on April 19, 1995, but the planning and preparation for the attack began months earlier. On March 26, 1995, Timothy McVeigh and Terry Nichols visited the site of the federal building in Oklahoma City to take measurements and assess security procedures.

4. In 1908, a severe tornado struck the town of Cherryvale, Oklahoma, killing at least nine people and destroying many buildings. The town's population had been celebrating the completion of a new school building earlier that day.

5. On March 26, 1924, African American educator and civil rights leader William J. Thompkins died in Oklahoma City. Thompkins had been instrumental in establishing Lincoln University in Jefferson City, Missouri, and had served as the principal of the Colored Agricultural and Normal University in Langston, Oklahoma.