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Mother Tounges in East Prussia 1905
(upload.wikimedia.org)
For the map enthused!
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DE Wikipedia says Masurian was a polish dialect, so you might think this was a way of disguising a polish minority as something else, but the Masurians opted German after WWI. The language was forbidden by the nazis (leopards...) and later died out as the people dispersed after WWII or were polonised.