1. On October 23, 1837, the United States government conducted a treaty signing with the Choctaw Nation. The treaty resulted in the forced relocation of the Choctaw people from their ancestral lands to Indian Territory, now known as Oklahoma.

2. In 1907, on October 23, President Theodore Roosevelt signed the proclamation officially making Oklahoma the 46th state of the United States. This day is celebrated annually as Oklahoma Statehood Day.

3. On October 23, 1964, the University of Oklahoma defeated the University of Texas football team 28-7 in the annual Red River Shootout. This victory was particularly significant as it marked the start of a streak of 47 consecutive Big Eight Conference wins for the OU football team.

4. In 1983, on October 23, a massive explosion occurred at the Kerr-McGee plutonium processing plant in Oklahoma City. The incident resulted in the deaths of four workers and extensive damage to the surrounding area.

5. On October 23, 2009, the NBA's Oklahoma City Thunder played their first regular season game in the city at the Ford Center, now known as Chesapeake Energy Arena. The team moved to Oklahoma City from Seattle, Washington and has since become a beloved sports franchise in the state.