Why is Pennsylvania called the Keystone State?

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Question: Why is Pennsylvania called the Keystone State?

Answer: A keystone is a wedge-shaped piece at the crown of an arch that locks the other pieces in place; it is a stone on which the associated stones depend for support. Geographically, Pennsylvania’s central location along the arch of the 13 original states calls to mind a keystone. Politically, Pennsylvania played a vital role in holding together the states of the newly formed Union.