1. On March 18, 1837, Pennsylvania became the first state to establish a public university system when it passed the Free School Law, which provided for the creation of free public schools throughout the state.

2. In 1937, one of the worst floods in Pennsylvania history began on March 18 and lasted for several days. The flooding caused extensive damage to homes, businesses, and infrastructure throughout the eastern part of the state, and resulted in the deaths of more than 50 people.

3. On March 18, 1893, the Lattimer Massacre took place in Luzerne County, Pennsylvania. The massacre occurred when a group of striking coal miners marching peacefully were fired upon by a group of sheriff's deputies, resulting in the deaths of 19 miners and injuries to many more.

4. On March 18, 1766, the first recorded performance of music in Pennsylvania took place in Philadelphia. The performance was given by a group of musicians from the First Battalion of New York, who played a concert of military music in the city's State House.

5. In 1899, on March 18, the Pennsylvania State Capitol building was dedicated in Harrisburg. The Capitol building was designed by architect Joseph Miller Huston, and is considered to be one of the most impressive examples of the Beaux-Arts style of architecture in the United States.