1. Delaware Ratifies the US Constitution - On August 15, 1787, Delaware became the first state to ratify the US Constitution, making it a significant date in the state's history. The signing took place at the Golden Fleece Tavern in Dover, and Delaware's status as the first state to ratify the Constitution earned it the nickname, "The First State."

2. Wilmington Race Riot Begins - On August 15, 1968, a race riot broke out in Wilmington, Delaware, leading to the arrest of over 350 people. The incident was sparked by racial tensions between the police and the black community in the city, and it lasted for several days.

3. Delaware Becomes a Slave-Free State - On August 15, 1776, Delaware's General Assembly passed a resolution calling for the end of slavery in the state. This made Delaware the first state to abolish slavery, although the final abolition didn't occur until much later. As such, August 15 has become an important date in the fight against racism and inequality.

4. Caesar Rodney's Historic Ride - On August 15, 1777, Caesar Rodney rode from Dover to Philadelphia to cast his vote in favor of the Declaration of Independence. The ride is considered a historic moment in Delaware's history, as Rodney's vote helped to secure the adoption of the document.

5. Delaware State Fair Begins - On August 15, 1919, the first Delaware State Fair was held. The event was a huge success and has since become an annual tradition. Today, the Delaware State Fair is a popular attraction, drawing visitors from all over the state and beyond.