1. The Pennsylvania Supreme Court Upholds Wetzel v. Craft's Prison Reform
On May 4, 1978, the Pennsylvania Supreme Court upheld the controversial Wetzel v. Craft's decision, which mandated drastic prison reforms in Pennsylvania. The case, filed by prisoners at the State Correctional Institution at Dallas, alleged that the Pennsylvania Department of Corrections violated their constitutional rights by subjecting them to inhumane and degrading living conditions.

2. Pennsylvania Witnesses Bloody and Violent May Day Protests in 1971
May Day protests erupted in several major cities across the United States in 1971, including Philadelphia, Pennsylvania. Protesters, who were largely anti-war and pro-labor, were met with terrible violence from police, who used tear gas and rubber bullets to disperse the crowds. In Philadelphia, several people were shot, and dozens were arrested.

3. Pittsburgh Pirates' Honus Wagner Retires on May 4, 1917
On May 4, 1917, baseball legend Honus Wagner announced his retirement from professional baseball after an incredible eighteen-year career. Wagner played his entire career for the Pittsburgh Pirates and won eight National League batting titles. He was inducted into the Baseball Hall of Fame in 1936.

4. The Pennsylvania State Capitol is Dedicated on May 4, 1906
On May 4, 1906, the Pennsylvania State Capitol was dedicated in Harrisburg, Pennsylvania. It took over a decade to construct the stunning Beaux-Arts-style building, which was designed by architect Joseph Miller Huston. The capitol building is listed on the National Register of Historic Places and is a must-see landmark for visitors to Pennsylvania.

5. Pennsylvania's Second Regiment Resumes Service After the Mexican-American War
On May 4, 1848, the Second Regiment of the Pennsylvania Volunteers, which had just returned from service in the Mexican-American War, resumed its duties. The regiment was originally formed in 1846 in response to President James K. Polk's call for volunteers to fight in the war. Over the course of its service, the regiment saw action in several major battles and earned a distinguished reputation for its bravery and discipline.