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 the German invasion of Czechoslovakia. After the German-Soviet invasion of Poland in 1939, the area became a part of Nazi Germany until 1945. After the war, the 1920 borders were restored. Historically, the largest specified ethnic group inhabiting this area were Poles. Under Austrian rule, Cieszyn Silesia was initially divided into three districts (Bielitz, Friedek and Teschen), and later into four, by adding Freistadt. One of them, Frýdek, had a mostly Czech population, the other three were mostly inhabited by Poles. During the 19th century the number of ethnic Germans grew. After declining at the end of the 19th century, at the beginning of the 20th century and later from 1920 to 1938, the Czech population grew significantly to rival the Poles. Another significant ethnic group were the Jews, but almost the entire Jewish population was murdered during World War II by Nazi Germany. In addition to...