1. The bombing of Pearl Harbor: December 7, 1941, is a significant date in world history, marking the bombing of Pearl Harbor by the Japanese, which led to the United States' entry into World War II. Many Oklahomans served in the military during the war, and the state's economy and industry were greatly affected by the conflict.

2. Oklahoma statehood: December 7, 1907, is the day that Oklahoma officially became a state. The area had been designated as Indian Territory before its statehood and was home to numerous Native American tribes. The state's history is deeply intertwined with that of the Native American peoples who lived there before and after settlement by European-Americans.

3. Oil discovery: On December 7, 1921, oil was discovered in the Osage Indian Reservation in Oklahoma. This led to a major boom in the state's economy, with many people and companies flocking to the area to take advantage of the newfound resource. Today, the oil and gas industry is still a major part of Oklahoma's economy.

4. The Murray Building Fire: December 7, 1923, marked one of the deadliest fires in Oklahoma history, with the Murray Building in downtown Tulsa burning down, killing 11 people and injuring dozens more. The tragedy led to many improvements in fire safety regulations and procedures in the city and around the state.

5. The Oklahoma City bombing trial: On December 7, 1997, Timothy McVeigh was found guilty of the Oklahoma City bombing that had taken place on April 19, 1995, killing 168 people. The trial, held in Denver, Colorado, lasted for six weeks and was closely watched by people all over the world. McVeigh was sentenced to death and executed on June 11, 2001.