1. On October 1, 1803, Ohio became the 17th state to join the United States of America. Prior to this, it was known as the Northwest Territory, and its inhabitants had been fighting for statehood for many years.

2. In 1910, the Ohio State Highway Commission was established on October 1. This was the first such commission in the country, and it was tasked with maintaining and improving the state's road network.

3. October 1, 1971, marks the day that the Columbus and Southern Ohio Electric Company ceased operation. This marked the end of an era for the electric railway system in Ohio, which had been in decline for many years.

4. The Cincinnati Reds won the National League pennant on October 1, 1990, after defeating the Houston Astros. This was the first time that the Reds had won the pennant since 1976, and they went on to win the World Series that year.

5. On October 1, 2019, the state of Ohio passed a law allowing workers' compensation claims for post-traumatic stress disorder (PTSD) suffered by first responders. This was a significant step forward for mental health advocacy in the state, as PTSD can be a debilitating condition for those who suffer from it.