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Pennsylvania is named the “Keystone” state because of its integral part in the historical vote for independence and for being the supporting vote for a new government.

Besides being known as the “Keystone” state, Pennsylvania has several other nicknames, including the “Quaker” state -named for the religion of the Quaker William Penn who settled the state. The “Coal” state, the “Oil” state and also the “Steel” state are three additional nicknames for Pennsylvania due to the state’s three largest industries.