This card came from Maura. 🙂
Pennsylvania is a US state that is located in the Northeastern and Mid-Atlantic regions of the United States, and the Great Lakes region. Pennsylvania is the 33rd most extensive, the 6th most populous, and the 9th most densely populated of the 50 United States. The state’s four most populous cities are Philadelphia, Pittsburgh, Allentown, and Erie. The state capital is Harrisburg. Pennsylvania is also the birthplace of independence and the Constitution.
A keystone is a central wedge in an arch that locks all other pieces of an arch in place. It is the part of an arch that all other parts depend upon. Pennsylvania’s popular nickname, “The Keystone State,” refers to this necessary element. Like most nicknames, it is not known, for certain, where this name originated, but there are a few interesting thoughts about how this nickname came to be. They are all based on the theme of the necessity of a keystone in a supporting structure.