1. On September 10, 1817, the Osage Treaty was signed, ceding millions of acres of land in present-day Oklahoma to the United States government. This treaty eventually led to the forced removal of the Osage people to Indian Territory in 1872.

2. The Oklahoma City bombing occurred on April 19, 1995, but on September 10 of that year, a memorial service was held in Oklahoma City to commemorate the victims and survivors of the attack. President Bill Clinton delivered a moving speech at the service, which was attended by thousands of people.

3. On September 10, 1904, petroleum was discovered in the Glenn Pool oil field near Tulsa. This discovery revolutionized the oil industry in Oklahoma and led to a period of economic growth in the state.

4. In 1963, civil rights leader Dr. Martin Luther King Jr. visited Oklahoma City and delivered a speech at the First Baptist Church. This speech was one of King's last before his assassination in 1968.

5. In a tragic event on September 10, 2001, Oklahoma native Lieutenant Heather "Lucky" Penney was one of two pilots ordered to take down United Airlines Flight 93, which was hijacked by terrorists and headed for Washington, D.C. Although the plane crashed in Pennsylvania before the jets could intercept it, Penney's heroic actions earned her the title of "The F-16 Angel of Death."