1. In 1787, Delaware became the first state to ratify the U.S. Constitution, making May 19 a significant day in American history. The state was one of the first to join the Union, and helped set the stage for the development of the United States government as we know it today.

2. On May 19, 1831, the Brandywine Springs Amusement Park opened in Wilmington, Delaware. The park was a popular destination for local residents and visitors to the area, featuring scenic gardens, a dance pavilion, a lake for boating and fishing, and various rides and attractions.

3. May 19, 1934 marked the founding of the DuPont Theatre (formerly the Playhouse Theatre) in Wilmington. The venue has hosted numerous Broadway plays, concerts, and other performances over the years, and remains a popular cultural landmark in the state.

4. On May 19, 1948, a group of aviation enthusiasts in Delaware formed the Dover Air Force Base Aero Club. The club was designed to provide recreational flying opportunities for local residents, and has since grown into a large and active organization that offers flight training and other services to members.

5. In 1970, Delaware became the first state to create an "Environmental Control" department aimed at protecting the state's natural resources and environment. May 19 marks the anniversary of the department's creation, and serves as a reminder of the importance of preserving and protecting the environment for future generations.