1. On May 21, 1934, the famous Wilmington Race Riot occurred. This was a violent confrontation between black and white residents of Wilmington that resulted in the deaths of several people and the destruction of a predominantly black neighborhood.

2. On May 21, 1610, Dutch navigator Cornelius Jacobsen Mey explored the Delaware Bay and became the first European to record information about the native Lenape people who lived in the area.

3. On May 21, 1975, the Kalmar Nyckel, a replica of the ship that brought the first Swedish settlers to Delaware in 1638, was launched. The ship now serves as a floating classroom and historic attraction in Wilmington.

4. May 21, 1983, marked the opening of the Delaware Agricultural Museum and Village in Dover. The museum showcases the state's important agricultural history and features exhibitions, workshops, and events.

5. On May 21, 1881, the first African American judge in Delaware, Charles M. Curtis, was born. Curtis went on to have a successful career as a lawyer and judge, and he was instrumental in fighting for civil rights for Delaware's black residents.