1. On August 1, 1876, the United States celebrated its centennial in Philadelphia with the opening of the Centennial Exhibition. The international exposition showcased technology, industry, and culture from around the world and attracted over 10 million visitors.

2. The world's first automobile race took place in Pittsburgh on August 1, 1895. The race covered a 5-mile (8 km) course and was won by Frank Duryea, who drove a gasoline-powered car built by himself and his brother.

3. Pennsylvania became the first state to officially observe Labor Day as a holiday on August 1, 1887. The holiday was established to recognize the contributions and achievements of American workers.

4. On August 1, 1951, Hershey's Chocolate Corporation introduced a new candy bar called the "Mr. Goodbar". The peanut-filled chocolate bar went on to become one of Hershey's most popular products.

5. The Battle of Brandywine, one of the largest battles of the American Revolutionary War, took place on August 11, 1777, near Chadds Ford, Pennsylvania. The battle resulted in a British victory and allowed them to capture Philadelphia. However, the battle also demonstrated the strength and determination of the American forces.