Trans-Olza

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Trans-Olza (Polish: Zaolzie, [zaˈɔlʑɛ] ; Czech: Záolží, Záolší; German: Olsa-Gebiet), also known as Trans-Olza Silesia (Polish: Śląsk Zaolziański), is a territory in the Czech Republic which was disputed between Poland and Czechoslovakia during the interwar period. Its name comes from the Olza River. The history of the Trans-Olza region began in 1918 when, after the collapse of Austria-Hungary, the newly-established Czechoslovakia claimed the area, which was mainly inhabited by Poles. Poland maintained control over the region and began to hold elections, to which Czechoslovakia responded by invading and annexing the territory in January 1919. The area as it is known today was created in 1920, when Cieszyn Silesia was divided between the two countries during the Spa Conference. Trans-Olza forms the eastern part of the Czech portion of Cieszyn Silesia. The division did not satisfy either side, and persisting conflict over the region led to its annexation by Poland in October 1938, following...

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