Wisconsin: The "Rotten" Spots

Here we have an ugly artifact with a strong upside. The map below is from 1918. It was prepared by the “hyper-patriots” of the Wisconsin Loyalty League. The shaded areas show the "rotten spotted" sections of Wisconsin "infected" with German immigrants. Oshkosh was rotten indeed. Just so happens those rotten spots were also where the breweries flourished. I'll take the shade any day.