1. Oklahoma became a state on January 1, 1907. After years of lobbying and political maneuvering, Oklahoma was finally granted statehood on this day. The state was created from the Indian Territory and parts of the Oklahoma Territory, and became the 46th state in the Union.

2. On January 1, 1818, the Osage Nation signed a treaty with the United States government, ceding a vast territory in present-day Oklahoma. The treaty was part of a larger effort by the federal government to remove Native American tribes from their lands and open up the area for white settlement.

3. In 1861, during the early days of the Civil War, the Confederate flag was raised over the Oklahoma capitol in Guthrie. Oklahoma was then part of Indian Territory, which sided with the Confederacy during the war. The event marked a key moment in Oklahoma's involvement in the conflict.

4. On January 1, 1941, the city of Tulsa experienced a devastating flood that killed 27 people and caused millions of dollars in damage. The flood was caused by heavy rains and snowmelt, and affected thousands of residents in the area.

5. January 1, 1890, saw the opening of the Oklahoma Land Run, a key event in the history of the state. Thousands of settlers rushed to claim land in Indian Territory, hoping to establish farms and businesses in the newly opened area. The land run helped to transform the region and played a significant role in the development of Oklahoma's economy and society.