That would be Adolf Hitler, as stated in this source (History.com) "Hitler appointed a new Nazi government, and on March 13 the Anschluss was proclaimed. Austria existed as a federal state of Germany until the end of World War II, when the Allied powers declared the Anschluss void and reestablished an independent Austria."
Adolf Hitler began rebuilding Germany's military and annexed Austria and Czechoslovakia.
The primary purpose of the Four Year Plan was to provide for the rearmament of Germany and to prepare the country for self-sufficiency in four years, from 1936 to 1940.
Hitler rose to power through the Nazi Party, an organization he forged after returning as a wounded veteran from the annihilating trench warfare of World War I.
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