In which region do Kansas, Nebraska, & the Dakotas fit?

[old timey villain]

I think the Census Bureau should just create new "great plains" region, because Kansas, Nebraska and the Dakotas are neither completely midwestern or completely western. The row of states stretching from Oklahoma to N. Dakota is really all its own, although Oklahoma's placement in the region is iffy.

The region has settlement patterns similar to the midwest, especially in the cities. But in terms of topography, geography, politics, climate and culture, it's pretty different. But it's also not like the west either, which in my opinion starts west of the Rockies.