1. In 1787, Delaware became the first state to ratify the United States Constitution. Delaware's ratification was a significant step in the formation of the new United States government.

2. In 1865, former Delaware Senator James A. Bayard Jr. was appointed as the United States ambassador to the United Kingdom, a position he held for two years.

3. In 1913, the DuPont Company's chemical research laboratory in Wilmington, Delaware, was destroyed by an explosion, killing three workers and injuring five others. The explosion was instrumental in improving the safety of chemical research facilities across the United States.

4. In 1930, the Delaware River Bridge (now known as the Benjamin Franklin Bridge) opened, connecting Philadelphia, Pennsylvania, to Camden, New Jersey, over the Delaware River. The bridge was the first major suspension bridge built in the United States.

5. In 1996, Delaware Governor Thomas R. Carper signed legislation legalizing slot machines in the state, making Delaware the first state on the East Coast to allow casino gambling. Today, Delaware is home to three casinos and is a major tourist destination for gambling enthusiasts.