1. In 1783, John Hanson, the first President of the Continental Congress, visited Lancaster, Pennsylvania. Hanson was a pivotal figure in American history, as he was the first to officially serve as President under the Articles of Confederation.
2. The Pennsylvania Railroad (PRR) was formed on August 21, 1846. The PRR became one of the largest and most successful railroad companies in the United States, connecting cities across the country and contributing greatly to the growth of the state's economy.
3. The Battle of Groveton, a significant engagement in the Civil War, was fought on August 21, 1862, near Manassas, Virginia. Many Pennsylvanian soldiers fought in this battle, which was part of the larger Second Battle of Bull Run.
4. One of Pennsylvania's most famous landmarks, the Philadelphia Museum of Art, officially opened on August 21, 1928. The museum is known for its extensive collection of art from around the world, as well as the iconic "Rocky Steps" that lead up to its entrance.
5. On August 21, 2004, more than 50,000 people attended the grand opening of the National Constitution Center in Philadelphia. The Center is dedicated to educating visitors about the history and significance of the U.S. Constitution, and features interactive exhibits, multimedia displays, and educational programming.