As a result of the Munich Agreement, Hitler promised to

Hitler promised that he would overturn the treaty with Versailles and stop reparations and to give Germany back her pride.

Hitler had promised British Prime Minister Neville Chamberlain and the German people that the Sudetenland would be his "last territorial demand" in Europe. In reality, it was only the beginning. And Hitler now wanted to grab the remainder of Czechoslovakia due to its strategic importance.