1. Ohio became the 17th state: On June 1, 1803, Ohio officially became the 17th state of the United States. It was the first state to be created out of the Northwest Territory.

2. First electric traffic light installed in Cleveland: On June 1, 1914, the first electric traffic light was installed in Cleveland, Ohio. The traffic light was located at the intersection of East 105th Street and Euclid Avenue.

3. Ohio State University established: On June 1, 1870, Ohio State University was established in Columbus, Ohio. Originally known as Ohio Agricultural and Mechanical College, the university has since become one of the largest and most well-respected universities in the country.

4. Ohio River floods: In 1937, the Ohio River flooded, causing widespread destruction and devastation throughout the state. The flood was caused by heavy rains and melting snow, and resulted in the evacuation of over 1 million people.

5. Pro Football Hall of Fame opens: On June 1, 1963, the Pro Football Hall of Fame opened in Canton, Ohio. The Hall of Fame is dedicated to preserving the history of professional football and honoring the game's greatest players and coaches.