1. Veteran's Day: November 11 is celebrated as Veteran's Day in the United States, and it holds a special place in Oklahoma's history. The state's strong military heritage is honored with official ceremonies and events across the state.

2. Armistice Day: November 11 is also known as Armistice Day, marking the end of World War I on November 11, 1918. The day became a national holiday in 1938, but it was changed to Veteran's Day in 1954 to honor all American veterans.

3. The Tulsa Race Massacre: On November 11, 1921, a white mob attacked and destroyed the prosperous black neighborhood of Greenwood in Tulsa. Over 300 people were killed, and more than 10,000 were left homeless. The massacre is considered one of the worst incidents of racial violence in American history.

4. Statehood Day: November 11 is also celebrated as Oklahoma Statehood Day, honoring the state's admission to the Union on November 16, 1907. The state's rich cultural heritage is celebrated with music, food, and other festivities across the state.

5. NASA's Mars Reconnaissance Orbiter: November 11, 2005, marked the launch of NASA's Mars Reconnaissance Orbiter from Cape Canaveral, Florida. The mission's goal was to study Mars' geology, climate, and other features in order to better understand the planet's potential for supporting life. The mission was a success, and the orbiter continued to operate until 2018.