1. The first Methodist Church in Delaware was established on March 15, 1778, in Wilmington. The church was founded by Robert Strawbridge and served as a significant meeting place for early Methodists in the state.

2. On March 15, 1935, the first president of Delaware State College, Dr. Richard Valcourt, was inaugurated. The college, now known as Delaware State University, was founded in 1891 as a school for African Americans and has since expanded to become a comprehensive university.

3. In 1822, Delaware's first steamboat, the Brandywine, made its maiden voyage on March 15th. The boat transported passengers and goods between Wilmington and Philadelphia, contributing to the growth of Delaware's economy and transportation infrastructure.

4. The Delaware National Guard was activated on March 15, 1968, to help quell civil unrest in Wilmington following the assassination of Martin Luther King Jr. The guard remained in the city for almost a week, and their presence prevented further violence.

5. On March 15, 1996, Delaware became the first state to offer online voter registration. The system, known as the Delaware Voter Information System, allowed residents to register to vote for the first time or update their existing registration via the internet. The state's online voter registration system is still in use today.