Nazi Germany's powerful grip tightened as it occupied and annexed Czechoslovakia's Sudetenland, a region with a majority German-speaking population, under the pretext of reuniting ethnic Germans. This move was sanctioned by the Munich Agreement, signed the day before by Germany, Italy, France, and the UK, in a failed attempt to appease Hitler's aggression. In a bold display of military might, German troops marched into the region, marking the beginning of the end of Czechoslovakia's sovereignty.