1. The world's first oil well was drilled in Pennsylvania on September 1, 1859: Edwin Drake successfully drilled a 69.5-foot oil well near Titusville, Pennsylvania, which would go on to become the site of the modern oil industry.

2. The Pennsylvania Station in New York City opened on September 1, 1910: Considered one of the most magnificent railroad stations ever built, Pennsylvania Station (also known as Penn Station) served as a hub for travelers until it was demolished in the 1960s.

3. Pennsylvania became the second state to ratify the U.S. Constitution on September 1, 1787: One of America's most important founding documents was ratified in Philadelphia, Pennsylvania, where the Constitutional Convention was held.

4. President George Washington laid the cornerstone for the U.S. Capitol building on September 1, 1793: The building, located in Washington D.C., would become the seat of the U.S. government and an iconic symbol of American democracy.

5. The Great Fire of Pittsburgh began on September 1, 1845: One of the most devastating fires in Pennsylvania's history, the Great Fire of Pittsburgh destroyed over 1,000 buildings and caused millions of dollars in damage, but ultimately led to the city's modernization and revitalization.