1. On June 23, 1788, Delaware became the first state to ratify the United States Constitution. Delaware was known as "The First State" because of its historical significance as the first state to ratify the Constitution.

2. In 1950, the Delaware Memorial Bridge, a suspension bridge spanning the Delaware River, was opened to traffic on June 23. The bridge connects Delaware and New Jersey and is one of the largest twin-span bridges in the world.

3. On June 23, 1919, a massive fire broke out in downtown Wilmington, Delaware, destroying over 200 buildings and causing $5 million in damage. The fire was one of the largest in Delaware's history and led to significant changes in fire safety regulations across the state.

4. In 1969, the first-ever NASCAR race was held at Dover International Speedway in Dover, Delaware, on June 23. The speedway, which opened in 1969, has hosted multiple NASCAR events each year and is a popular destination for racing fans.

5. On June 23, 1904, William "Judy" Johnson, a famous baseball player from Wilmington, Delaware, was born. Johnson played for the Negro leagues and was known for his exceptional skill as a third baseman. He was later inducted into the Baseball Hall of Fame in 1975.