1. Statehood Day: On December 12, 1907, Oklahoma officially became the 46th state in the United States of America. The day is celebrated as Statehood Day across the state.

2. Tinker Air Force Base: The Tinker Air Force Base, located in Midwest City, Oklahoma, was named after Major General Clarence L. Tinker on December 12, 1947. Tinker was a member of the Osage Nation and the first Native American to attain the rank of major general in the U.S. Army Air Corps.

3. Woody Guthrie: The legendary American singer-songwriter, Woody Guthrie, was born on December 12, 1912, in Okemah, Oklahoma. Guthrie's music was heavily influenced by the Dust Bowl and the Great Depression, and he is best known for his song "This Land Is Your Land."

4. University of Central Oklahoma: On December 12, 1890, the Territorial Legislature of Oklahoma passed an act to establish a normal school in Edmond, Oklahoma. This school would later become the University of Central Oklahoma, one of the largest universities in the state.

5. Oil Industry: December 12, 1893, is the date of the first commercial oil well in Oklahoma, located near Bartlesville. This event marked the beginning of Oklahoma's oil industry, which would become one of the state's largest industries and a major source of revenue.