central illinois is home to one of the largest corn fields on our planet, and sprinkled amongst it are 5 moderately sized cities spread fairly equidistantly apart from each other arranged in a neat little isosceles triangle.
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the cities are all around 40 - 45 miles from each other, with the exception being springfield up to peoria which is around 60 miles.
individually, they are all relatively small potatoes, but they contain a lot of important anchors to the state's economy, governance, and education, and the combined UA populations of these 5 cities is ~800K (i'm using UA here because i'm not really concerned about all of the corn farmers in the region who would still be there regardless of how the cities got arranged).
Peoria (2010 UA: 266,921) is the largest of the group and has the biggest geographical reason for existing as a port city on the IL river (and was until recently home to Caterpillar, now HQ'd in suburban dallas).
Springfield (2010 UA: 161,316) is the second largest of the bunch and of course is IL's state capital.
Champaign/Urbana (2010 UA: 145,361) is home to the U. of Illinois, one of the largest and most prestigious public universities in the midwest.
Bloomington/Normal (2010 UA: 132,600) is home to Illinois state university, the state's #3 public university, and is also home to state farm insurance.
Decatur (2010 UA: 93,863) was, until recently, home to Archer Daniels Midland (or ADM, a large argribusiness conglomerate now HQ'd in chicago).
i wonder had IL been able to coalesce these 5 cities into a single urban center in the central part of the state (perhaps at peoria, which has the most obvious geographical reason for being where it is), creating an MSA somewhere around 1M people, might that have created enough critical mass for the whole to be even greater than the sum of its parts? perhaps ADM and caterpillar don't move their HQ's to other cities if they were already in a 1M+ MSA with multiple other F500 HQ's? perhaps the state capitol/flagship university synergy builds enough self-sustaining momentum to turn this hypothetical city into a more dynamic place like madison, or perhaps even something approaching a columbus level? perhaps this hypothetical city is big enough to anchor a single major airport with much better connections such that people aren't tempted to drive to STL, ORD, or IND to chase lower fares? would downstate IL feel different with a bona fide urban center all its own that was separate from chicagoland (and not one glommed onto a large metro area anchored in a neighboring state (ie. st. louis' metro east)?
are there other examples around the country of groupings of relatively closely spaced, but also fully independent, small cities (let's say UA's <250K) that together could've amounted to a much greater whole had the people, economy, and culture of the region all coalesced into a single city?