1. In 1775, the Continental Congress authorized the establishment of the United States Marine Corps, which has been based in Pennsylvania for a significant portion of its history. The Marines' Camp Lejeune was established in 1941 in North Carolina, but the Marine Corps Reserve Center in Philadelphia was established in 1916, and the Marine Barracks at the Philadelphia Navy Yard was commissioned in 1829.

2. In 1889, the Pennsylvania Academy of the Fine Arts opened its new building at Broad and Cherry Streets in Philadelphia. The building was designed by Frank Furness and George W. Hewitt in the Victorian Gothic style, and is considered one of the most important works of architecture in the city.

3. In 1922, the first nationally broadcast college football game was played at Franklin Field in Philadelphia between the University of Pennsylvania and the University of Chicago. The game featured future NFL Hall of Famers Fritz Pollard and Amos Alonzo Stagg.

4. In 1966, the lunar lander test vehicle crashed during a training exercise at the Langley Research Center in Virginia, killing astronaut Theodore Freeman, a native of Haverford, Pennsylvania. Freeman had been selected for the astronaut corps in 1963 and was training for the Apollo program at the time of his death.

5. In 2017, Pennsylvania became the fourth state in the country to legalize online gambling. The bill, signed into law by Governor Tom Wolf, allowed for online casino games, poker, and sports betting to be offered by licensed operators in the state. The move was seen as a way to generate additional revenue for the struggling state budget.