1. The Oklahoma Centennial Monument was unveiled on February 26, 2007, to commemorate the state's 100th anniversary. The monument is located at the state capitol and features a bronze sculpture of a Native American guiding a wagon train.

2. On February 26, 1924, the Supreme Court of the United States ruled in favor of the Osage Nation in a case involving oil leases on their land. The ruling affirmed the tribe's sovereignty and right to control their natural resources.

3. One of Oklahoma's most famous musicians, Reba McEntire, was born in McAlester on February 26, 1955. McEntire has won numerous awards and sold over 80 million records worldwide.

4. Ada Lois Sipuel Fisher, a civil rights activist and the first African American student to attend the University of Oklahoma, was born on February 26, 1924. She successfully sued for admission to the law school in 1948, paving the way for integration at the university.

5. On February 26, 2009, a tornado struck Lone Grove, Oklahoma, causing significant damage and claiming eight lives. The tornado was part of a larger outbreak that affected several southern states.