After World War II in summer 1945 the Potsdam Conference decided that Sudeten Germans would have to leave Czechoslovakia ( see Expulsion of Germans after World War II ) . As a consequence of the immense hostility against all Germans that had grown within Czechoslovakia due to Nazi behavior , the overwhelming majority of Germans were expelled ( while the relevant Czechoslovak legislation provided for the remaining Germans who were able to prove their anti-Nazi affiliation )
Potsdam Conference
Potsdam Conference
Sudetenland