I hadn't heard the term Ag Coast to describe St. Louis region, but I like that moniker.  Here is a link to a piece in Agrinews.

http://www.agrinews-pubs.com/markets/ag-coast-of-america-expanding-ingredients-in-place-to-feed/article_4b3c170a-07c8-11ea-95d2-47c6e38c4d1b.html