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."
Answer: Why is Abbasid important?
The Abbasids, who ruled from Baghdad, had an unbroken line of caliphs for over three centuries, consolidating Islamic rule and cultivating great intellectual and cultural developments in the Middle East in the Golden Age of Islam.
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