1. On September 12, 1787, the Pennsylvania Constitution was adopted, becoming the first state constitution in the United States to be approved by a popular vote.

2. On September 12, 1905, the first gasoline pump was installed in the state of Pennsylvania by S.F. Bowser in Fort Wayne.

3. In 1958, on September 12, the Philadelphia Eagles played their first game at Franklin Field after leaving Shibe Park, beating the New York Giants 35-27.

4. On September 12, 1971, the first United States Women's Open Golf Championship was held at the the LaGrange Country Club in Havertown, Pennsylvania.

5. September 12, 1994, marked the opening of the Allegheny Highlands Trail in Pennsylvania, a popular 11-mile recreational trail for hiking and biking that follows the old Baltimore and Ohio Railroad bed.