1. On May 14, 1804, the Lewis and Clark Expedition passed through what is now Oklahoma on their way to explore the western territories of the United States.

2. On May 14, 1889, Oklahoma's first newspaper, the Guthrie Daily Leader, began publication.

3. May 14, 1935, marks the day the infamous Dust Bowl storms began to reach their peak in Oklahoma. This natural disaster had a significant impact on the state's economy and population for years to come.

4. On May 14, 1954, the United States Supreme Court issued its landmark decision in Brown v. Board of Education, declaring that segregation in public schools was unconstitutional. This decision had a significant impact on Oklahoma, which had been at the forefront of the school desegregation movement.

5. May 14, 2009, saw the opening of the American Indian Cultural Center and Museum in Oklahoma City. This facility showcases the rich and diverse cultures of Oklahoma's Native American communities and their contributions to the state's heritage.