Question: Gau East Prussia was formed in 1933 in Nazi Germany initially as a district within the Free State of Prussia, in 1939, East Prussia expanded following the annexation of which location, that was defined by the Treaty of Versailles in 1920 and refers to the most northern part of the German province of East Prussia, when as Memelland it was put under the administration of the Council of Ambassadors?
Sentence (from "Klaipėda Region"): The Memel Territory, together with the other parts severed from Germany, the Saar and Danzig, was to remain under the control of the League of Nations until a future day when the people of these regions would be allowed to vote on whether the land would return to Germany or not.
Relevant evidence: No