Statistics for occurrence #1 of “United States” in chapter 3.6 of Robert Underwood Johnson, Clarence Clough Buell, Battles and Leaders of the Civil War: The Opening Battles. Volume 1.:

...
Abner Doubleday, Brevet Major-General, U. S. A., Retired. As senior captain of the 1st Regiment of United States Artillery, I had been stationed at Fort Moultrie, Charleston Harbor, two or three years previous to the outbreak of 1861. There were two other forts in the harbor. Of these, Fort Sumter was unocc...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
United States (United States) 100,886 266 0 0 0 user votes
United States (New Mexico, United States) 6 0 0 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.