Statistics for occurrence #1 of “United States” in chapter 25, page 436 of Thomas Wentworth Higginson, Harvard Memorial Biographies:

... In August, 1861, he passed the examination of the Naval Board, was commissioned Acting Assistant Surgeon, and soon after joined the North Atlantic Blockading Squadron as Acting Surgeon on board the United States steamer Cambridge. Thus at the commencement of hostilities he became the first volunteer in his position from New England, and the vessel in which he sailed was the first merchant steamer that left...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
United States (United States) 100,886 90 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.