Statistics for occurrence #1 of “United States” in chapter 14 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 5: Forts and Artillery.:

...mpanies officers of the army who had made a scientific study of this new means of communication, and the result was a benefit to the roads and the Government. The construction corps of the United States Military Railroads had a comparatively easy time at City Point under General McCallum. There was plenty of hard work, but it was not under fire, and so expert had they become that the laying of tra...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
United States (United States) 100,886 92 0 0 0 user votes
United States (New Mexico, United States) 6 0 0 0 0 user votes

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