Show Several Reasons Advanced for Keystone Nickname I The nickname Keystone used for Pennsylvania says the Philadelphia Inquirer is of doubtful origin but the theory given most credence is that it was so named because of its central position among the states at the time of the adoption of the Federal Constitution Other theories advanced are arc that the name is derived derived de de- de rived from Crom the arch of a bridge across the Rock creek between Georgetown and Washington D. D C. C which contained 13 stones named for tor the 13 original states The keystone was marked with the letters Pa A drawing on display at the American Ameri can Philosophical society which was given to this COWl country try by France Francein in 1784 represents the 13 American states in nn inthe the form of a stone arch with Pennsylvania in hi the keystone position Another suggestion Is that Pennsylvania was the last colony to vote voto for Cor the Declaration of ot Independence Inde Inde- completing thus the Arch of Liberty |