1. Delaware became the first state to ratify the United States Constitution on December 1, 1787. The state's nickname of "The First State" commemorates this historic event.

2. On December 1, 1913, the DuPont Company opened its first black powder plant on the Brandywine River in Wilmington. The plant produced gunpowder for cannons and other weapons during World War I and II.

3. The University of Delaware's first female president, Dr. E. Arthur Trabant, was inaugurated on December 1, 1987. During her tenure, the university saw significant growth and expansion.

4. Delaware's first licensed radio station, WDEL, began broadcasting on December 1, 1930. The station provided news, music, and sports coverage to the state for over 90 years.

5. On December 1, 1959, the Delaware Memorial Bridge was dedicated. The bridge spans the Delaware River and connects Delaware and New Jersey. At the time of its construction, it was the longest suspension bridge in the world.