1. Delaware became a state: September 30, 1779 marks the day when Delaware became the first state to ratify the U.S. Constitution. This historic event was commemorated with the creation of Constitution Day, observed annually on September 17.

2. Battle of Cooch's Bridge: On September 3, 1777, the largest battle of the Revolutionary War in Delaware took place near Cooch's Bridge. Though the British were able to capture the area, it paved the way for General George Washington's victory at Brandywine a week later.

3. The Diamond State: The state nickname for Delaware, "The Diamond State", comes from the state's small size and the belief that it was so valuable that it could fit in a box the size of a jewel. This phrase first appeared in print in a letter to President Andrew Jackson from Caesar A. Rodney in 1831.

4. State Seal: Delaware's state seal features a farmer and a soldier, which symbolize the importance of agriculture and defense to the state. There are also images of wheat, an ear of corn, and a ship in the background.

5. First women's college: Located in Newark, Delaware, the Women's College of Delaware (now the University of Delaware) was the first institution of higher learning exclusively for women in the United States when it opened its doors in 1914.