1. Benjamin Franklin's "Join, or Die" cartoon was published in a New Jersey newspaper on August 20, 1774. The cartoon showed a snake cut into pieces, each representing a British colony, and urged them to unite against British rule.

2. On August 20, 1858, the first transatlantic cable was completed between Ireland and Newfoundland. This allowed for much faster communication between Europe and North America, and was seen as a major technological achievement at the time.

3. In 1920, on August 20, the 19th Amendment was ratified, giving women the right to vote. New Jersey played a key role in this process, being one of the states to ratify the amendment early on.

4. The Battle of Camden in the American Revolutionary War took place on August 20, 1780. The British army, led by General Charles Cornwallis, defeated the Continental Army in a decisive victory.

5. The first steam-powered ferry to cross the Delaware River started operating on August 20, 1834. The ferry, called the "John Stevens," was invented by a New Jersey resident named Robert Livingston Stevens, and allowed for much faster transportation between New Jersey and Pennsylvania.