1. The Ohio Constitution was adopted on March 18, 1851, replacing the state's original constitution from 1802. The new constitution established a more democratic government, with clearer separation of powers and increased voter rights.

2. On March 18, 1937, a natural gas explosion at a school in New London, Texas killed over 295 people, mostly children. The tragedy prompted increased safety regulations and code changes in schools across the country, including Ohio.

3. The first organized baseball game in Ohio was played on March 18, 1867, between the Cincinnati Red Stockings and the Kekiongas of Fort Wayne. The Red Stockings won 47-1, and went on to become one of the most successful early baseball teams.

4. Ohio-born pilot Jerrie Mock became the first woman to fly solo around the world on March 18, 1964. She completed the 23,000-mile journey in just over one month, and received widespread acclaim for her achievement.

5. On March 18, 1959, the Ohio State Legislature designated the Ladybug as the state's official insect. This was in part due to the work of Ohio schoolchildren, who had lobbied for the Ladybug's recognition as a symbol of the state's natural beauty and agriculture.