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 "Gau East Prussia"): In 1939, East Prussia expanded following the annexation of the Klaipėda Region from Lithuania and the occupation of Poland, while a sliver of territory from the gau was transferred to Reichsgau Danzig-West Prussia.
Relevant evidence: Yes