A further 154,000 colonists, including locals, were settled by the Prussian Settlement Commission in the provinces of Posen and West Prussia before World War I. Military personnel was included in the population census.
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Starting in December, the Polish-Ukrainian War expanded the Polish republic's territory to include Volhynia and parts of Eastern Galicia, while at the same time the German Province of Posen (where even according to the German made 1910 census 61,5% of the population was Polish) was severed by the Greater Poland uprising, which succeeded in attaching most of the province's territory to Poland by January 1919.
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German political scientist Stefan Wolff, Professor at the University of Birmingham, says that the actions of Polish state officials after the corridor's establishment followed "a course of assimilation and oppression".
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A number of former settlers from the Prussian Settlement Commission who settled in the area after 1886 in order to Germanise it were in some cases given a month to leave, in other cases they were told to leave at once.
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He presented an offer, which included a proposal that Britain would agree to Germany offering to guarantee the borders of Poland, taking Danzig, and a referendum in the Polish corridor.
Prior to 1939, the division's primary focus was on German activity in the free city of Danzig as well as security preparations for war over the Polish Corridor question.
Over the time span 1920–1939 Sulmin together with the village of Richthof was part of the Polish Corridor arranged according to the regulations of the Treaty of Versailles.