1. Delaware became the first state to ratify the United States Constitution on March 31, 1787. This event led to Delaware being known as "The First State."

2. On March 31, 1865, Confederate troops under General Robert E. Lee launched the final assault against Union forces in the Battle of Five Forks, Virginia, marking the beginning of the end of the American Civil War.

3. Delaware's first known black legislator, Thomas Henry Morris, was born on March 31, 1856. Morris served in the Delaware House of Representatives from 1895-1896 and was an advocate for civil rights.

4. On March 31, 1911, the DuPont Company introduced a new type of paint called Duco, which would become a popular alternative to traditional oil-based paint.

5. Legendary Delaware boxer Dave Tiberi was born on March 31, 1963. Tiberi had a successful career in professional boxing, with a record of 22 wins, 0 losses, and 1 draw. He famously defeated James Toney in 1992, though controversially lost a split decision to Sumbu Kalambay later that year. Tiberi's career was cut short due to injuries, but he remains a beloved figure in Delaware's sports history.