Dallas is too far south and Chicago is too far north.
Would've been interesting if St. Louis had become the big interior juggernaut, as was once expected prior to the civil.war.
Kinda reminds of this parallelogram of the 4 major de facto capitals of the northeast, southeast, midwest and south central.
The only thing that really disrupts this is that Dallas has a true same size rival (Houston) only 200 miles to its south. The other three are all the unchallenged alphas of their respective zones.