I've seen a few polls online trying to determine which states people would include in the "Midwest". There's no unanimity, just a core of states almost everyone would include (those beginning with "I") plus others--is Ohio in, how about western PA? Is Nebraska in or out, etc.?
It struck me this morning that the term "Midwest" has a similar relationship to the geography and society found in that general area as the term "race" has to the people who might be included in a specific "race".
This is all in the context of discussions of whether "race" is "real"--many on the left would say race isn't real. I think it's real in some sense, but once you start defining it you find the concept fuzzy and sometimes evanescent.