1. On June 28, 1778, the Battle of Monmouth took place in New Jersey, which included significant Delawarean involvement. The Delaware Regiment, led by Colonel David Hall, played a crucial role in the battle, and Delaware native John Haslet was killed in action.

2. In 1831, William Morris received a patent for his invention of the nail-making machine. Morris was a Wilmington, Delaware resident, and his invention revolutionized the nail-making industry, making it faster and more efficient.

3. June 28, 1865, marked the end of slavery in Delaware, two and a half years after the Emancipation Proclamation was signed. Delaware was the last state to formally abolish slavery.

4. In 1895, the first automobile race in Delaware took place on June 28 between Wilmington and Newark. Five cars competed, with the winning car completing the 20-mile course in just under an hour.

5. On June 28, 1919, Delaware Governor John G. Townsend, Jr. signed the Delaware Women's Limited Suffrage bill, which granted women the right to vote in Delaware's school board elections. This was a significant step towards women's suffrage in Delaware, and the rest of the country would follow suit in the coming years.