During the period of appeasement in the late 1930s, the Nazi regime under Adolf Hitler was able to annex several territories, including the Rhineland, Austria (Anschluss), and the Sudetenland, as well as occupy Czechoslovakia. However, one significant area that the Nazis did not acquire during this period of appeasement was Poland.
The Polish government refused to cede territory to Germany, especially the Free City of Danzig and the Polish Corridor, which separated East Prussia from the rest of Germany. Consequently, diplomatic attempts and appeasement strategies failed, and Nazi Germany invaded Poland on September 1, 1939, marking the beginning of World War II. The failure of appeasement is often highlighted by the inability to prevent German aggression toward Poland and other nations.