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the Sudentenland Germans case is very sad. They were invited to live in the mountainlands during the 1600s to 1700s and lived there for centuries. They were 90% + of the population by 1914

In 1918 when Austria-hungary was broken up and much of what was the Austrian half was disbanded. The Sudentenland should have, ethnically speaking been given to Austria (and Austrians wanted to join the other Germanic peoples in Germany), but that was denied

There were sound defense reasons for the Bohemians for this (since it's always better to own the higher ground), but the Czechs then in the 20s and 30s pretty much banned the German dialect (you can say payback for 500 years of domination by the Germanics)

As an oppressed linguistic group, they unfortunately saw the Nazis as a way out and they had the highest percentage of people joining the Nazis