Statistics for occurrence #1 of “Northern Illinois” in entry united-states-of-america-idaho of Harper's Encyclopedia of United States History:

... Northern Illinois
(Indian, Edah hoe), one of the States of the northwestern division of the Union. Its name signifies light on the mountains. ...
Max. Freq. Min. Freq.
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† 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.