I was reading something on Standard German and Swiss High German when I came across this interesting map.




Source

I find it very interesting to see how the map shows the German influence has historically evolved from times of Reich and its expansion left German language speaking minorities practically all over the eastern Europe and parts of France. What I find a bit surprising though is that even some minor cities e.g. in Poland had their Germanic equivalents. I only knew of few like Warchau, Breslau, Danzig and so on and so forth. Same applies to other neighbouring countries. Never crossed my mind though that every city had it's own Deutsch original name. Perfectly planned invasion in detail

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Guess it's because these regions used to be German until 1945 for some 1000 years or longer. So of course every village has its German translation still, at least in German memory. But with the downfall of communism in 1989 also the Polish, Czechs ... get aware of their partly German history.

It was 1947 for Sudetenland to be cleared off Germans in Czechoslovakia, but your post is correct. The boarder regions were some 95% German. People were painfully aware of all sorts of occupation and being annexed (be it Habsburgs, Russians, Prussians...), even before the revolution in 1989, though. Some places cultures peacefully coexisted, some places were a lot more turbulent.

Here is the answer. The regions were part of historical Prussia, hence their Germanic names and minorities speaking German language can be found exactly in the same region shown on old maps.