Statistics for occurrence #1 of “Pennsylvania” in chapter 3 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 10: The Armies and the Leaders.:

... made his headquarters before marching against the French, in 1755, with young George Washington as an aide on his staff; and here on April 13th of that year the Governors of New York, Massachusetts, Pennsylvania , Maryland, and Virginia had met, in order to determine upon plans for the expedition. In the vicinity were Mount Vernon, the estate of Washington, and Arlington, which remained in the family of Was...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Pennsylvania (Pennsylvania, United States) 12,690 26 2 0 0 user votes

† This entity has been selected by the automated classifier as the most likely match in this context. It may or may not be the correct match.