1. On March 21, 1911, the Ohio General Assembly passed the first workers' compensation law in the United States. The law provided injured workers with medical benefits and wage replacement for time missed due to work-related injuries or illnesses.

2. In 1836, the Ohio State Board of Agriculture was established in Columbus. The board's goal was to promote agriculture and rural development throughout Ohio, and it remains active today.

3. On March 21, 1983, the Ohio State Buckeyes won the NCAA Men's Basketball Championship by defeating the University of North Carolina Tar Heels 67-62. The game was held at The Pit in Albuquerque, New Mexico.

4. In 1817, the first sawmill in Dayton, Ohio began operations. The sawmill was powered by the waters of the Mad River and helped to establish Dayton as a center for manufacturing and industry.

5. On March 21, 1932, a devastating tornado hit the town of Russellville, Ohio. The tornado caused extensive damage to the town and surrounding areas, killing 16 people and injuring more than 100 others.