1. On August 20, 1664, the Dutch surrendered the colony of New Netherland (which included what is now Delaware) to the English, marking the beginning of English rule in the region.

2. August 20, 1824 saw the founding of the town of Clayton, Delaware. Originally known as "Duck Creek Cross Roads," the town was named after John M. Clayton, a prominent lawyer and politician.

3. In 1863, on August 20, the 4th Delaware Infantry was involved in the Battle of Rappahannock Station during the American Civil War. The regiment helped defend a Union Army position against a Confederate attack.

4. August 20, 1920 was the date on which Delaware ratified the 19th Amendment to the U.S. Constitution, which granted women the right to vote.

5. On August 20, 1989, a tornado touched down in Delaware, causing widespread damage and one fatality. The tornado, which reached F3 intensity on the Fujita scale, was part of a larger outbreak that affected several states in the region.