Statistics for occurrence #1 of “Fort Jefferson” in chapter 9 of George Bancroft, History of the United States from the Discovery of the American Continent, Vol. 10:

... between the mouth of the Ohio and the parallel of 36° 30′; and in the spring of 1780, Clark, choosing a strong and commanding situation five miles below the mouth of the Ohio, established Fort Jefferson as the watch on the father of rivers. Could the will of Charles the Third of Spain defeat the forethought of Jefferson? Could the intrigues of Florida Blanca stop the onward wave of the backwoods...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Fort Jefferson (Florida, United States) 181 2 9 0 0 user votes
Fort Jefferson (Ohio, United States) 1 0 1 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.