1. In 1947, Oklahoma became the first state to implement a sales tax. This tax was initially set at 2%, but has since increased to 4.5%.

2. On August 9, 1956, the first nationally televised political convention was held in Oklahoma City. The convention was for the Democratic Party and was broadcast on both NBC and CBS.

3. In 1967, Oklahoma City experienced a major flood during the month of August. This flood caused extensive damage to the city and resulted in millions of dollars in losses. However, it also led to the creation of a new flood control project that has since helped prevent future flooding.

4. On August 9, 1974, President Gerald Ford selected Oklahoma Senator Robert S. Kerr as the new chairman of the National Committee for Mental Hygiene. This appointment helped to elevate the issue of mental health in the national spotlight.

5. In 2014, a record-breaking tornado touched down in Moore, Oklahoma on August 9. This tornado was one of the most powerful in the state's history, with winds reaching up to 210 mph. Although the tornado caused significant damage, there were no fatalities reported.