Other In the summer of 1938, Hitler claimed that the Sudetenland, a border region of Czechoslovakia with a German-speaking majority, needed to be saved by Germany and threatened war if his demand was not met. On September 30, 1938, the British and French leaders, hoping to avoid a war, agreed to this act of appeasement, officially allowing Germany to annex the Sudetenland, without Czechoslovakian input.