Silésie tchèque
With the exception of the areas around Cieszyn, Ostrava, and Hlučín, Czech Silesia was predominantly settled by German-speaking populations up until 1945. Following the Second World War, Czech Silesia and Hlučínsko were returned to Czechoslovakia and the ethnic Germans were expelled. The border with Poland was once again set along the Olza (although not confirmed by treaty until 1958).