The the Czech lands

The Czech lands were parts of the HRE for centuries, but still remained mainly Czech-speaking, although with a large German-speaking minority. The areas both north and south of the Czech lands became largerly German--speaking. How come that German did not become dominant in all of the Czech lands, but just the border areas to other parts of the HRE?

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The Czechs were there first. Plenty of the upper and middle classes spoke German, but there was hardly a lot of funding going to universal, compulsory education to teach German. Even if there was, there would be the matter of which dialect it would be and if it would really matter for their idea of nationhood. The Dutch and Swiss had centuries of statehood and their own culture, so saw themselves as separate from Germany. I believe that they were often kept out of elections for the Holy Roman Emperor and that the only king (officially) in the HRE for a time was King of the Romans.
 
But an area like for instance Silesia had been Slavic speaking, but because of German immigration had switched to German. The same applies to many other areas in East-Central-Europe. Also, part of the Czech lands had become German-speaking. Many areas had changed language. I am not here only talking about the modern nationalistic age, but gradual language shift in pre-nationalist time.
 
But an area like for instance Silesia had been Slavic speaking, but because of German immigration had switched to German. The same applies to many other areas in East-Central-Europe. Also, part of the Czech lands had become German-speaking. Many areas had changed language. I am not here only talking about the modern nationalistic age, but gradual language shift in pre-nationalist time.

The Poles in Silesia were marginalised by the Germans who are Protestant, later a lot of them either Germanised or Fled to the PLC - I think a Polish Catholic Majority Silesia could have been a province loyal to the Habsburgs and less likely to be lost by the Habsburgs than Bohemia and Moravia.
 
Iirc, Kaiser Henry VI had split off Moravia into a separate principality shortly before he died in 1197. However, they were reunited after his death. Perhaps if he lived longer and they stayed separate, Moravia might succumb to Germanisation, leaving the Czechs of Bohemia as an enclave.
 
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