Český Těšín (Polish: Czeski Cieszyn) is a town in the northeastern Czech Republic, on the Olza river, in Moravian-Silesian Region.
Until 1918 it was called Saska Kępa (Sachsenberg) and was a suburb of the Austrian-Hungarian town of Cieszyn in the Duchy of Cieszyn, within Cieszyn Silesia. Following the fall of the dual monarchy, the Polish and Czechoslovak local councils agreed on a partition of the area running along ethnic lines. In 1919, with Poland fighting on its eastern frontiers, Czechoslovakia (fighting in Slovakia against Red Hungarian Army), driven chiefly by economic aims, invaded the area up to the Olza river (which included the suburb), later agreeing to hold a plebiscite. However, in 1920, with Poland engaged in the Polish-Soviet war, Czechoslovakia -with international approval- annexed the area, leaving a sizeable Polish minority on the Czech side. In 1938, following the Munich agreement, Poland regained the rest of the town lost earlier, but in 1939 whole city was annexed by Germany. It was divided along the previous 1920 border again in 1945.
The town is a small centre of commerce and paper industry.
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