1. Election Day: November 4th of every even-numbered year marks Election Day in Delaware, where citizens vote for candidates running for various offices, including the U.S. President, Senator, and Representative.

2. Anniversary of the Mandeville Farm Tragedy: On November 4, 1939, a tragic fire took place at Mandeville farm in Delaware, which killed seven members of a family who were in a barn at the time. This incident is still remembered as one of the deadliest fires in the state's history.

3. Delaware River and Bay Authority Established: November 4, 1963, marks the day when the Delaware River and Bay Authority was established. This bi-state agency is responsible for operating and maintaining several transportation facilities and infrastructure, including the Delaware Memorial Bridge, Cape May-Lewes Ferry, and airports.

4. Sanctioning of the Wilmington Riverfront Development: On November 4, 1985, plans for developing the Wilmington Riverfront were sanctioned, initiating a significant transformation of the city's waterfront. The developments included commercial, residential, and recreational areas, which have continued to expand over the years.

5. The Great Law of 1682 Issued: The Great Law of 1682, one of the foundational documents of Delaware's state government, was issued by William Penn on November 4, 1682. This law helped establish a system of government and laws that governed the residents of the colony. It was one of the earliest examples of democratic governance in the United States.