How To Use Keystone state In A Sentence

But Pennsylvania's so critical in presidential politics, it's fitting that it be called the keystone state. CNN Transcript Oct 17, 2004
Keystone stater
Didion is a keystone state whose lands adjoin those of the other three realms. IRONCROWN MOON: PART TWO OF THE BOREAL MOON TALE
Didion is a keystone state whose lands adjoin those of the other three realms. IRONCROWN MOON: PART TWO OF THE BOREAL MOON TALE
The Keystone state produced half the global supply of petroleum until Texas elbowed it aside in 1901.

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Of the 956 workers who died in coal-mining accidents in the U.S. in 1891, for example, more than two-thirds perished in the Keystone State.