Final answer:
Hitler demanded a "German only" plebiscite for Austria's annexation into Germany in March 1938, followed by the occupation of the Sudetenland without a plebiscite after the Munich Pact in September 1938.
Step-by-step explanation:
Adolf Hitler demanded a "German only" plebiscite for the annexation of Austria into Germany in March 1938. This plebiscite followed the Anschluss, or union, which occurred with the backing of many Austrians, albeit under the influence of German occupation and Nazi propaganda. Despite the annexation being against the Treaty of Versailles, the referendum showed overwhelming support for becoming part of Germany, although the voting conditions were likely manipulated.
Hitler's next target was the region of Czechoslovakia known as the Sudetenland, which had a considerable German-speaking population. He demanded that the Sudetenland join Germany, and this was eventually conceded to him by British and French leaders at the Munich Conference in September 1938. The occupation did not involve a plebiscite, as the Munich Pact itself legitimized Hitler's claim on the Sudetenland.