1. Statehood Day: November 20th marks a significant day in Oklahoma history, as it is Statehood Day. On this day in 1907, Oklahoma became the 46th state in the United States of America.

2. Oklahoma City Bombing: Another notable event that occurred on November 20th in Oklahoma history is the Oklahoma City bombing. In 1995, a truck bomb exploded outside the Alfred P. Murrah Federal Building in downtown Oklahoma City, killing 168 people and injuring hundreds more.

3. First Flight: On November 20, 1918, Oklahoma City saw its first official airplane flight take off. The plane, piloted by Arthur Goebel, was the first-ever to leave Will Rogers World Airport in Oklahoma City.

4. Sporting events: Oklahoma history also saw a few notable sporting events on November 20th. In 1965, the Oklahoma Sooners defeated the Nebraska Cornhuskers in a historic football game that saw a record crowd of over 71,000 fans in attendance. In 2013, basketball legend LeBron James became the youngest player in NBA history to score 20,000 points, accomplishing the feat in a game against the Oklahoma City Thunder.

5. Oklahoman Authors' Day: November 20th is also recognized as Oklahoman Authors' Day. The day is a tribute to the many talented authors who hail from Oklahoma, including Ralph Ellison, S.E. Hinton, and Woody Guthrie.