Statistics for occurrence #1 of “Illinois” in chapter 5 of George Bancroft, History of the United States from the Discovery of the American Continent, Vol. 3, 15th edition.:

...nto the Tombecbee, his party ingloriously floated down the river. In the last days of June, he landed on the banks of the Bayou St. John. But where was D'Artaguette, the brave commander in the Illinois , the pride of the flower of Canada? And where was the gallant Vincennes, whose name, in honor of the founder of a state, is borne by the oldest settlement of Indiana? The young D'Artaguette had...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Illinois (Illinois, United States) 6,200 72 0 0 0 user votes
Illinois (New Mexico, United States) 4 0 0 0 0 user votes
Illinois (Oregon, United States) 2 0 0 0 0 user votes
Illinois (Colorado, United States) 0 0 0 0 0 user votes
Illinois (Illinois, United States) 0 0 0 0 0 user votes
Illinois (New Mexico, 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.