The Sudentenland was a part of Germany before WWI. After WWI, it was given to Czechoslovakia, but there were many ethnic Germans living there. Hitler wanted to unite those people with his own. Hitler did not want to go to war over this, but he was willing to do so. The Allied powers (Britain, France, Russia) did not want to fight another war so they agreed to give Hitler this land on the condition that he did not make any more territorial demands. The signing of the Munich agreement transferred power of the Sudentenland to Germany. Would war have been worthwhile at that point?