What is the meaning of Keystone State?

Pennsylvania; -- a nickname alluding to its having been the central one of the 13 original United States.
Webster's Revised Unabridged Dictionary
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APAWebster's. (2011). keystone state. Retrieved September 21, 2026, from http://smartdefine.org/keystone_state/definitions/2025344
ChicagoWebster's. 2011. "keystone state" http://smartdefine.org/keystone_state/definitions/2025344 (accessed September 21, 2026).
HarvardWebster's 2011, keystone state, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/keystone_state/definitions/2025344>.
MLAWebster's. "keystone state" 27 May 2011. Web. 21 September 2026. <http://smartdefine.org/keystone_state/definitions/2025344>
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