1. In 1803, Ohio was admitted as the 17th state in the United States on January 20th. This historic event was a significant milestone for Ohio, marking its transition from an organized territory to a fully-fledged state.

2. On January 20, 1862, the Battle of Mill Springs was fought in Kentucky. Ohio troops played a crucial role in this battle, helping to secure a critical Union victory in the early stages of the Civil War.

3. Cleveland, Ohio native Alan Freed coined the term "rock and roll" on January 20, 1952, while working as a radio DJ in Cleveland. This term would go on to become synonymous with a new genre of popular music that was taking the country by storm.

4. On January 20, 1990, the Cincinnati Reds announced that they would be retiring the number 14 in honor of Pete Rose, a legendary player who had spent much of his career with the team. This was a rare honor, as only a select few players have had their numbers retired by the Reds.

5. In 2017, Donald Trump was inaugurated as the 45th President of the United States on January 20th. While this event did not take place in Ohio, it was still a significant moment in American history, and one that was no doubt felt by many Ohioans.