Statistics for occurrence #1 of “Portsmouth” in entry united-states-of-america-new-hampshire of Harper's Encyclopedia of United States History:

...and William Stark, formed from the New Hampshire troops by the express desire of Lord Loudon......1756 First newspaper in New Hampshire and the oldest in New England, New Hampshire , published at Portsmouth ......August, 1756 On application of New York, the King in council declares the western bank of the Connecticut River the boundary between New Hampshire and New York......July 20, 1764 Concord...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Portsmouth (New Hampshire, United States) 470 225 134 39 0 user votes
Portsmouth (United Kingdom) 107 15 13 5 0 user votes
Portsmouth (Dominica) 0 0 0 0 0 user votes
Portsmouth (Iowa, United States) 0 0 0 0 0 user votes
Portsmouth (Kentucky, United States) 0 0 0 0 0 user votes
Portsmouth (Virginia, United States) 0 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.