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Germany issued an ultimatum to Lithuania, demanding the return of the Klaipėda Region under threat of invasion.
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1939 German ultimatum to Lithuania
German diplomatic demand on Lithuania
On 20 March 1939, Nazi Germany's foreign minister Joachim von Ribbentrop presented an oral ultimatum to Juozas Urbšys, foreign minister of Lithuania. Germany demanded that Lithuania give up the Klaipėda Region which had been detached from Germany after World War I, or the…Source: Wikipedia (CC BY-SA)
Klaipėda Region
Area of East Prussia
The Klaipėda Region or Memel Territory was defined by the 1919 Treaty of Versailles in 1920 and refers to the northernmost part of the German province of East Prussia, when, as Memelland, it was put under the administration of the Entente's Council of Ambassadors. The Memel…Source: Wikipedia (CC BY-SA)