As is often the case in the countries where it could be, quite a striking difference between repopulated ethnically-cleansed regions and the rest of the country.
Although it is interesting that in the Czech Republic, such areas are strongest for what at this stage we can call the populist right, whereas the opposite is true in Poland. My understanding is that a lot of what was once the Sudetenland is very post-industrial, which I suppose would go some way to explaining it.
That's really interesting, yeah. Isn't Silesia also a heavily postindustrial region?