It's not. Not sure what the official boundary is (if there even is one), but Midwest is far east of Western. It would better be called 'Norcentral' these days,

It's not. Not sure what the official boundary is (if there even is one), but Midwest is far east of Western. It would better be called 'Norcentral' these days, but the name is probably left over from times when St Louis was considered western