1. Delaware became the first state to ratify the United States Constitution on September 4, 1787. Delaware was a small but influential state and its ratification helped pave the way for other states to follow suit.

2. On September 4, 1887, the Wilmington and Northern Railroad opened service between Wilmington and Reading, Pennsylvania. The railroad played an important role in the economic development of northern Delaware.

3. September 4, 1901, marked the opening of Wilmington's first modern hotel, the Hotel du Pont. The hotel was built by the Du Pont family and was intended to attract business travelers and tourists to Wilmington.

4. On September 4, 1972, the Wilmington race riots began after the fatal shooting of a black man by a white police officer. The riots lasted for three days and resulted in multiple deaths, injuries, and arrests.

5. On September 4, 2006, Delaware became the first state to legalize sports betting after the Supreme Court struck down a federal ban on the practice. The move paved the way for other states to follow suit and led to a boom in the sports betting industry.