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The Upper Silesia plebiscite, mandated by the Versailles Treaty to determine a section of the border between Weimar Germany and Poland, is held.
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1921 Upper Silesia plebiscite
Voting regarding the German–Polish border
The Upper Silesia plebiscite was a plebiscite mandated by the Versailles Treaty and carried out on 20 March 1921 to determine ownership of the province of Upper Silesia between Weimar Germany and the Second Polish Republic. The region was ethnically mixed with both Germans and…Source: Wikipedia (CC BY-SA)
Treaty of Versailles
One of the treaties that ended World War I
The Treaty of Versailles was a peace treaty signed on 28 June 1919. As the most important treaty of World War I, it ended the state of war between Germany and most of the Allied Powers. It was signed in the Palace of Versailles, exactly five years after the assassination of…Source: Wikipedia (CC BY-SA)
Weimar Republic
German state from 1918 to 1933
The Weimar Republic, officially known as the German Reich, was the German state from 1919 to 1933, during which it was a constitutional republic for the first time in history; hence it is also referred to, and unofficially proclaimed itself, as the German Republic. The period's…Source: Wikipedia (CC BY-SA)
Poland
Country in Central Europe
Poland, officially the Republic of Poland, is a country in Central Europe. It extends from the Baltic Sea in the north to the Sudetes and Carpathian Mountains in the south, bordered by Lithuania and Russia to the northeast, Belarus and Ukraine to the east, Slovakia and the Czech…Source: Wikipedia (CC BY-SA)