Statistics for occurrence #1 of “Wabash River” in entry united-states-of-america-indiana of Harper's Encyclopedia of United States History:

...Grouseland, near Vincennes......Aug. 21, 1805 Laws of Indiana published at Vincennes by Messrs. Stout & Smoot......1807 Illinois Territory set off from Indiana, comprising all west of the Wabash River and a line drawn north from Post Vincennes......Feb. 3, 1809 Property qualifications of 50 acres, or a town lot valued at $100, required of electors in Territory by act of Congress......Feb. 26, ...
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