Statistics for occurrence #1 of “Ohio” in entry brown-john of Harper's Encyclopedia of United States History:

...ed himself ready to make war on all the free-labor States; and he declared. in a letter to the President (Nov. 25), that he had authority for the belief that a conspiracy to rescue Brown existed in Ohio , Pennsylvania. New York, and other States. Attempts were made to implicate leading Republicans in a scheme for liberating the slaves. A committee of the United States Senate, with James M. Maso...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Ohio (Ohio, United States) 4,328 891 10 1 0 user votes
Ohio (United States) 1,611 200 1 0 0 user votes
Ohio (Colorado, United States) 12 0 0 0 0 user votes
Ohio (Illinois, United States) 0 0 0 0 0 user votes
Ohio (Missouri, United States) 0 0 0 0 0 user votes
Ohio (New York, United States) 0 0 0 0 0 user votes
Ohio (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.