1) In 1850, the United States government signed a treaty with the Choctaw tribe, which allowed for the construction of a railroad through their territory, which eventually became part of Oklahoma.
2) On September 9, 1893, the Cherokee Strip Land Run occurred, which was the largest land run in Oklahoma history, resulting in the opening of nearly six million acres of land to settlement.
3) In 1945, Tulsa-based oil company Sunray DX announced the discovery of a large oil field in the Oklahoma panhandle, which became one of the largest oil fields in North America.
4) September 9, 1976, marked the opening of the Tulsa Performing Arts Center, a hub for live music, theater, and other performing arts events in the state.
5) In 2001, the Oklahoma City National Memorial was dedicated on September 9, in honor of the victims of the 1995 Oklahoma City bombing. The memorial includes a reflecting pool, a large field of empty chairs to symbolize those lost, and a museum dedicated to the tragedy.