Gerrymandering

Not even in Iowa, a state which many consider to be the height of sensible redistricting pratices.  Check out these district maps - they look as tortured as anything you’d see in California, Texas, etc. 

Of course, these are county supervisor districts, not Congressional.  But it still proves that in smaller, “less complex” states a kind of surface uniformity evaporates as you drill down into smaller and smaller segments.  Kind of like physics at the quantum level as opposed to the movements of galaxies.