https://simple.wikipedia.org/wiki/Midwestern_United_States#/media/File:Midwestern_United_States_subdivisions.svg https://simple.wikipedia.org/wiki/Midwestern_Un

https://simple.wikipedia.org/wiki/Midwestern_United_States#/media/File:Midwestern_United_States_subdivisions.svg https://simple.wikipedia.org/wiki/Midwestern_United_States#/... "Divisions of the Midwest by the U.S. Census Bureau into East North Central and West North Central, separated largely by the Mississippi River." https://en.wikipedia.org/wiki/Central_United_States#/media/File:US_Census_Central_Divisions.svg https://en.wikipedia.org/wiki/Central_United_States#/media/F... “Census Bureau Divisions with "Central" in their name include the West North Central and East North Central in the Midwest. Along with the West South Central and East South Central in the South.” Midwest may be more usual but North Central is not unheard of. (That said, one can perfectly understand “western Midwestern US States” as the western part of the region called Midwest and be fine with it.)