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The nickname "The Keystone State" refers to Pennsylvania's central role in the founding of the United States. The term "keystone" is a metaphor for the vital role Pennsylvania played in the economic, political, and social development of the nation, particularly during the American Revolution and the early years of the Republic. The state housed the Continental Congress and was the site of the signing of the Declaration of Independence and the Constitution, making it a crucial "keystone" in the arch of American history.

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1w ago

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