1. On March 23, 1837, the Ohio Legislature authorized the formation of the cities of Dayton, Toledo, and Columbus. Dayton, located in southwestern Ohio, is now known for its aviation history and is home to the National Museum of the United States Air Force. Toledo, located in northwestern Ohio, is known for its glass manufacturing and outdoor recreation opportunities. Columbus, located in central Ohio, is the state capital and home to The Ohio State University.

2. On March 23, 1901, Ohio native Granville T. Woods was granted a patent for an improved steam boiler furnace. Woods was a prolific inventor and held over 50 patents related to electrical and mechanical devices. He is known for his contributions to the development of the trolley car system and the multiplex telegraph, among other technologies.

3. On March 23, 1916, the Ohio Railroad Commission ordered the discontinuation of the controversial "Jim Crow" car segregation on the state's railroads. The practice, which enforced racial segregation on trains, was widely protested by civil rights organizations and Black citizens. The commission's ruling was a significant victory for the civil rights movement in Ohio.

4. On March 23, 1963, the Cuyahoga River in northeast Ohio caught fire for the first time. The river, which had become polluted with industrial waste, was infamous for its foul odor and flammable properties. The incident helped to galvanize the environmental movement and led to the passage of the Clean Water Act in 1972.

5. On March 23, 2018, the Ohio State Buckeyes men's basketball team defeated the Gonzaga Bulldogs in the NCAA tournament, sending them to the Elite Eight. The Buckeyes, who are known for their passionate fanbase, went on to reach the tournament's second round for the second time in three years. The team has won the Big Ten championship multiple times and is considered a perennial contender in college basketball.