Statistics for occurrence #1 of “United States” in entry forts-morgan-and-gaines-seizure-of of Harper's Encyclopedia of United States History:

...ve any distinguished strangers the government may see fit to send on a visit to us. Fort Gaines, on Dauphin Island, opposite Fort Morgan, shared the fate of the latter. That morning, Jan. 4, the United States revenue cutter Lewis Cass was surrendered to the collector of the port of Mobile (q. v.). See Bowyer, Fort.
...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
United States (United States) 100,886 16,340 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.