1. Delaware became the first state to ratify the Constitution on February 28, 1787, making it a crucial day in United States history.
2. On February 28, 1955, Delaware Senator Joseph R. Biden Jr. was born in Scranton, Pennsylvania, later becoming the 47th Vice President of the United States under President Barack Obama.
3. In 1929, nine prisoners attempting to escape from the Delaware State Penitentiary were killed on February 28 during what is known as the "Convict Massacre".
4. On February 28, 1986, Delaware woman Joanne Iverson fatally shot her husband during an altercation, later becoming the first woman in the state to receive a life sentence for murder.
5. In 1941, the DuPont Company announced it had developed a new synthetic rubber on February 28, which was used to make tires during World War II.