1. Delaware became the first state to ratify the United States Constitution on January 15, 1787. This was a significant moment in American history, as it paved the way for the creation of a united federal government.

2. On January 15, 1880, the Wilmington & Northern Railroad was incorporated. This railway became an important transportation link in Delaware, connecting Wilmington with the coal mines of Pennsylvania.

3. The Delaware River and Bay Authority was established on January 15, 1962. This agency was created to oversee the operation of the Delaware Memorial Bridge and other transportation projects in the region.

4. William DuPont Jr., a prominent businessman and philanthropist, was born in Wilmington on January 15, 1896. He played a significant role in the development of the DuPont Company and was known for his generous support of charitable causes.

5. Delaware native Tom Carvel, the founder of Carvel Ice Cream, passed away on January 15, 1990. Carvel was a beloved figure in the state, known for his innovative marketing strategies and his signature soft-serve ice cream.