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Kashubians in West Prussia were a population with firmly Polish national identity, Roman Catholic religion, and they were strongly Anti-German.
Counties of West Prussia such as Puck (Putzig), Wejherowo (Weyersfrey), Kartuzy (Karthaus) and eastern part of Człuchów (Schlochau) had Kashubian majority. Kościerzyna (Berent) and Chojnice (Konitz) had mixed Kashubian-Polish majority. Counties such as Starogard (Stargard), Tczew (Dirschau), Tuchola (Tuchel), Świecie (Schwetz), western part of Kwidzyn (Marienwerder), eastern part of Złotów (Flatow), Chełmno (Kulm), Toruń (Thorn), Wąbrzeźno (Briesen), Lubawa (Löbau) and Brodnica (Strasburg) had Greater Polish (Greater Poles are a subdivision of Poles) majority. Danzig Highlands county had strong Kashubian and Greater Polish minority.
Wałcz (Krone), Człuchów (Schlochau) and counties east of the Vistula (Elbląg/Elbing, Malbork/Marienburg, Susz/Rosenberg) had German majority.
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Generally the division of West Prussia between Poland and Germany after 1918 corresponded pretty well to ethnic structure of the region:
Yellow = to Poland after WW1
Green = to Free City Danzig
Red = to East Prussia
Blue = to Germany
Orange was part of Prov. Posen
German population censuses themselves (as well as the results of Reichstag elections) indicated that the Corridor had Polish majority:
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