1. Delaware Ratifies the Constitution: On December 7, 1787, Delaware became the first state to ratify the United States Constitution. This landmark event was a crucial step towards forming a more unified nation.

2. First State Capitol Building Opened: In 1791, Delaware's first state capitol building opened its doors in Dover. This historic structure served as the seat of government for the First State until 1933 and remains an important symbol of Delaware's rich history.

3. The USS Delaware: The USS Delaware was commissioned on December 19, 1910, and was the fourth battleship to bear the name. This battleship played a crucial role in World War I, providing support for American forces both in Europe and across the Atlantic.

4. Delaware Elects its First Female Governor: On December 19, 1992, Ruth Ann Minner was elected as Delaware's first female governor. Minner served as governor from 2001 to 2009 and was a strong advocate for education, job creation, and environmental protection.

5. Delaware's Role in the Underground Railroad: Delaware played a significant role in the Underground Railroad, providing safe passage for escaped slaves seeking freedom in the North. On December 19, 1865, the 13th Amendment to the United States Constitution was ratified, finally abolishing slavery throughout the entire country.