How did it end up so much more consistently Republican than Chicago suburbs or Minneapolis suburbs?
Minnesota has a much more loyally Democratic tradition, doesn't it? As for Chicago, the Chicago suburbs used to be MUCH Whiter than they are today.
But even the white ones don't vote like the WOW Counties. The only other midwestern city comparable at all is Cincinnati (but there while the suburbs are super Republican, they're less so than they used to be). For some reason while the upscale white collar suburbs of practically every other northern metro have moved leftward over the last two decades, Milwaukee has bucked the trend.
What will be interesting to see is if the trend continues to be bucked in the WOW Counties in a Post-Trump world.