The Treaty of Saint Germain-en-Laye was an agreement signed with Austria at the Paris Peace Conference on 10 September 1919. It saw the Austro-Hungarian Empire broken up, and Austrian territory was used to create new countries, for example, Czechoslovakia.

The Treaty of St Germain then ordered the transfer of Bohemia and Moravia to Czechoslovakia and Bosnia Herzegovina to Yugoslavia from the defeated Austria. Better luck next time, guys.