1. On October 21, 1682, William Penn received a deed for "the Three Lower Counties" of Delaware from the Duke of York, marking the beginning of Delaware's colonial period as a part of Pennsylvania.

2. In 1804, the USS Constitution, also known as "Old Ironsides," anchored off Delaware's Cape Henlopen during a mission to protect American shipping from French privateers during the Napoleonic Wars.

3. On October 21, 1820, the Delaware Agricultural Society was established in Dover, promoting the development of the state's agricultural industry and the sharing of farming knowledge and techniques.

4. The Delaware Art Museum was officially opened on October 21, 1938, showcasing a collection of American art and inspiring a thriving arts community in the state.

5. In October 2017, Delaware celebrated the opening of the Wilmington Riverfront, a revitalized area featuring a riverwalk, restaurants, a beer garden, and other amenities that have transformed the city's waterfront area.