Statistics for occurrence #1 of “Rhode Island” in chapter 6, page 129 of George Bancroft, History of the United States from the Discovery of the American Continent, Vol. 4, 15th edition.:

...ica exceeded that in Canada fourteen fold. Of persons of African lineage the home was chiefly determined by climate. New Hampshire, Massachusetts, and Maine may have had three thousand negroes; Rhode Island , four thousand five hundred; Connecticut, three thousand five hundred; all New England, therefore, about eleven thousand. New York alone had not far from eleven thousand;
...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Rhode Island (Rhode Island, United States) 3,308 30 0 0 0 user votes
Rhode Island (California, United States) 2 0 0 0 0 user votes
Rhode Island (New York, United States) 0 0 0 0 0 user votes
Rhode Island (Texas, 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.