1. Delaware became the first state to ratify the United States Constitution on December 5, 1787. Known as "The First State", Delaware's ratification helped pave the way for the nation's founding document to go into effect.

2. On December 5, 1831, the railroad known as the New Castle and Frenchtown Railroad was chartered, becoming the first railroad in Delaware. This transportation system helped connect Delaware to other states and paved the way for the state's industrial growth.

3. Delaware's first female governor, Ruth Ann Minner, was inaugurated on December 5, 2001. Minner served as governor from 2001 to 2009, making history as one of the few female governors in the United States.

4. The Caesar Rodney School District in Delaware was established on December 5, 1949. The district is named after Caesar Rodney, a Delaware statesman who is known for his role in the American Revolution and signing the Declaration of Independence.

5. On December 5, 2008, Delaware became the first state in the United States to legalize sports betting. Under this law, sports betting could only take place at racetracks or casinos, but it was still a significant change in the state's gambling laws.