1. In 1985, a confrontation between Philadelphia police and the radical group MOVE resulted in the bombing and subsequent destruction of an entire city block. Eleven people, including five children, were killed in the incident.

2. On May 13, 1846, the US Congress declared war on Mexico, beginning the Mexican-American War. Pennsylvania was a strong supporter of the war effort, sending thousands of troops to fight for the Union.

3. One of the deadliest disasters in Pennsylvania history occurred on May 13, 1877, when a revolving swing ride collapsed at a local fairgrounds. Sixteen people were killed and dozens more were injured in the tragedy.

4. In 1989, the "Kids for Cash" scandal came to light in Pennsylvania, involving the conviction of thousands of juveniles for minor offenses and their subsequent placement in for-profit juvenile detention centers. The scandal rocked the state's criminal justice system and led to calls for reform.

5. On May 13, 1787, representatives from several states gathered in Philadelphia to begin the Constitutional Convention, which would ultimately lead to the drafting of the United States Constitution. Pennsylvania played a crucial role in the formation of the new government, hosting the convention and providing several important delegates.