Maybe we need a sticky in each subforum that tells what states (or parts of states) are considered part of that region. For example, I live in western SD. I would consider that Great Plains, but would consider (JMO, it doesn't have to be my way, it just needs to be uniform so people can find one-another) Missouri part of the South. Somebody who lives in South Carolina might see it totally differently though.
Today there is no black or white, only shades of gray.