1. On June 1, 1842, the Pennsylvania state legislature passed an act creating the Pennsylvania Railroad Company. This would go on to become one of the largest and most significant transportation companies in American history, helping to connect the Midwest and East Coast and facilitating industrial growth and expansion.

2. In 1774, the colony of Pennsylvania held its first Provincial Conference in response to increasing tensions with Great Britain. The conference was held in Carpenters' Hall in Philadelphia on June 1, and was attended by 56 delegates who discussed the rising tensions and developed a series of resolutions to send to the Continental Congress.

3. On June 1, 1864, Confederate General Jubal A. Early launched an attack on Union forces in Eastern Pennsylvania, beginning the Battle of Cold Harbor. The battle would last for several days and result in heavy losses for both sides, with the Union ultimately emerging victorious.

4. One of the most famous moments in Pennsylvania sports history also occurred on June 1, when the Pittsburgh Penguins won their first Stanley Cup championship in 1991. Led by superstar players Mario Lemieux and Jaromir Jagr, the Penguins defeated the Minnesota North Stars in six games to claim the iconic trophy.

5. On June 1, 1792, the Pennsylvania State House in Philadelphia (now known as Independence Hall) was partially destroyed in a fire. The flames were put out before they could cause too much damage, and the building was eventually restored and remains a symbol of American independence and democracy to this day.