The nickname for Pennsylvania is The Keystone State, symbolizing its central role in American history.

Pennsylvania is known as The Keystone State, a nickname that highlights its crucial position in early American history. As one of the original 13 colonies, Pennsylvania played a key role in uniting the nation, especially during the American Revolution and in the creation of the U.S. Constitution. The term "keystone" refers to the central stone in an arch, symbolizing Pennsylvania’s pivotal position in holding the fledgling United States together. Today, this nickname celebrates the state’s significant historical contributions and its continued importance in the nation's political, cultural, and economic landscape.