NATIONAL PENNSYLVANIA DAYNational Pennsylvania Day on July 20th recognizes the second state to join the Union. Once the home of the temporary capital of the United States in Philadelphia, Pennsylvania is also known as the Keystone State. While the source of the nickname has been forgotten, the meaning is not lost. Bridge builders know leaving the vital keystone out of their structure would be folly, leading to collapse. It has many keynote states ,wonders and many topics .Lest learn more things about it and spread the subject on this day .