1. In 1783, the Treaty of Paris was signed, officially ending the Revolutionary War and recognizing the United States as an independent nation. The signing took place in Paris, but the peace negotiations began in Paris, Pennsylvania.

2. On August 27, 1908, the first official Boy Scout troop in the United States was established in a YMCA in Lower Merion Township, Pennsylvania. The Boy Scouts of America had been founded earlier that year in England by Sir Robert Baden-Powell.

3. Steel magnate Andrew Carnegie was born on August 27, 1835 in Dunfermline, Scotland. Carnegie immigrated to the United States as a child and eventually became one of the richest men in the world. He used his wealth to fund philanthropic efforts, including the construction of more than 1,500 libraries.

4. In 1859, oil was discovered in Titusville, Pennsylvania, leading to America's first oil rush. The discovery of oil in Pennsylvania had a profound impact on the state's economy and contributed to the rise of the petroleum industry in the United States.

5. On August 27, 1955, a record-breaking 22 inches of rain fell in just 24 hours in Upper Darby, Pennsylvania. The flood that followed caused extensive damage and claimed 16 lives. The event remains one of the worst natural disasters in Pennsylvania's history.