1. In 1774, the First Continental Congress met in Philadelphia. This historic gathering, which lasted until October 26, was held in response to the passage of the Coercive Acts, a series of punitive measures imposed by the British parliament in response to the Boston Tea Party. The Congress was attended by representatives from all thirteen American colonies, and was a crucial step in the lead up to the American Revolution.

2. On September 5, 1836, the first train entered the city of Philadelphia. The train was part of the Philadelphia, Germantown and Norristown Railroad, a pioneering rail line that was one of the earliest in the United States. The arrival of the railroad marked a major turning point in the city's history, as it facilitated the growth of industry and commerce, and helped make Philadelphia one of the largest and most prosperous cities in the country.

3. In 1882, the first Labor Day parade was held in New York City. Although not directly related to Pennsylvania, this event was significant for the state and the nation as a whole, as it marked the beginning of a movement to recognize and honor the contributions of working people. The holiday was recognized by the federal government in 1894, and has since become an important part of American culture and society.

4. On September 5, 1945, an explosion occurred at the Hercules Powder Company plant in Kenvil, New Jersey, killing 57 people and injuring over 100 more. The explosion, which was caused by the accidental ignition of ammonium nitrate fertilizer, was one of the deadliest industrial accidents in U.S. history. The tragedy underscored the need for increased safety regulations in the workplace, and led to major reforms in the chemical industry.

5. In 1991, Latrell Sprewell was drafted by the Golden State Warriors in the first round of the NBA draft. Although not a major historical event, this was a significant moment in the career of one of Pennsylvania's most famous basketball players. Sprewell went on to have a successful career in the NBA, playing for the Warriors, New York Knicks, and Minnesota Timberwolves. He was named an All-Star four times, and is widely regarded as one of the most talented and exciting players of his generation.