1. Statehood Day: July 1, 1907, is a significant day in Oklahoma history because it marks Oklahoma's official statehood into the United States. This day is celebrated annually as Oklahoma's Statehood Day, and it is a time for Oklahomans to reflect on the state's rich history and culture.

2. First Territorial Governor: On July 1, 1889, George Washington Steele was appointed as Oklahoma's first territorial governor. Steele helped oversee the early development of Oklahoma, including laying the groundwork for statehood.

3. Oil Boom: Oklahoma's oil boom began in the early 20th century and had a significant impact on the state's economy. On July 1, 1948, Phillips Petroleum Company struck oil in Oklahoma's Anadarko Basin, which helped fuel the state's economic growth for decades.

4. Tulsa Race Massacre: One of the darkest moments in Oklahoma's history occurred on July 1, 1921, when the Tulsa Race Massacre took place. A white mob attacked and destroyed the prosperous black neighborhood of Greenwood, killing hundreds and leaving thousands homeless.

5. Centennial Celebration: In 2007, Oklahoma celebrated its centennial, marking 100 years since becoming a state. The centennial celebration included a variety of events and festivities, including a parade, fireworks, and a concert by Garth Brooks.