1. In 1735, John Adams, the second President of the United States, was born in Braintree, Massachusetts. Although not a Pennsylvania native, Adams visited the state several times during his career and played a major role in the founding of the United States.

2. In 1775, one of the earliest instances of organized resistance to British rule erupted in Pennsylvania when a group of settlers gathered in Burning Springs to protest the British government's taxation policies. This event is considered by some historians to be a precursor to the American Revolution.

3. In 1862, the Battle of Perryville took place in Kentucky, which had significant repercussions for Pennsylvania: as a result of the battle, Confederate forces were prevented from advancing into the state, ensuring that Pennsylvania remained in Union hands for the duration of the Civil War.

4. In 1900, the famous Philadelphia photographer Charles Sheeler was born in Philadelphia. Sheeler is best known for his striking images of industrial objects and urban landscapes, and his work is considered to be an important contribution to the development of modern art in the United States.

5. In 1938, Orson Welles' radio broadcast of "The War of the Worlds" caused widespread panic throughout the country, including in Pennsylvania. Many listeners believed that the broadcast was a real news report of an alien invasion, and emergency services across the state were inundated with calls from terrified residents. Although the incident put Welles' name on the map, it remains a cautionary tale about the power of media and the public's susceptibility to misinformation.