also called Midwest, or North Central States, region, northern and central United States, lying midway between the Appalachian and Rocky mountains and north of the Ohio River and the 37th parallel. The Middle West, as defined by the federal government, comprises the states of Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, Nebraska, North Dakota, Ohio, South Dakota, and Wisconsin.
in Encyclopædia Britannica online
Aaahhh! Então é aí que há problemas!!