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Northwest TerritoryFormerly Old Northwest.
A historical region of the north-central United States extending from the Ohio and Mississippi Rivers to the Great Lakes. The area was ceded to the United States by the Treaty of Paris in 1783. It was officially designated a territory in 1787 and later split up into the territories and present-day states of Ohio, Indiana, Illinois, Michigan, Wisconsin, and part of Minnesota. Control over the territory was a major issue in the War of 1812.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Placename) See Old Northwest
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
the region north of the Ohio River and east of the Mississippi, organized by Congress in 1787, comprising present-day Ohio, Indiana, Illinois, Michigan, Wisconsin, and the E part of Minnesota.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.