According to the 9th century Bavarian Geographer, the West Slavic Opolanie tribe had settled on the upper Oder River since the days of the Migration Period, centered around the gord of Opole. At the time of Prince Svatopluk I (871–894), all Silesia was a part of his Great Moravian realm. Upon its dissolution after 906, the region fell under the influence of the Přemyslid rulers of Bohemia, Duke Spytihněv I (894–915) and his son Vratislaus I (915–921), possibly the founder and name giver of the Silesian capital Wrocław (Czech: Vratislav).

Until 990 the newly installed Piast duke Mieszko...

Upper Silesia is situated on the upper Oder River, north of the Eastern Sudetes mountain range and the Moravian Gate, which form the southern border with the historic Moravia region. Within the adjacent Silesian Beskids to the east, the Vistula River rises and turns eastwards, the Biała and Przemsza tributaries mark the eastern border with Lesser Poland. In the north, Upper Silesia borders on Greater Poland, and in the west on the Lower Silesian lands, the adjacent region around Wrocław also referred to as Middle Silesia.
It is currently تقسیم, الگ کریں into a larger Polish and the smaller Czech Silesian...

The Upper Silesia plebiscite was a border referendum mandated سے طرف کی the Versailles Treaty and carried out in March 1921 to determine a section of the border between Weimar Germany and Poland. The region was ethnically mixed, chiefly among Germans and Poles. According to prewar statistics, ethnic Poles formed 60 percent of the population. The period of the plebiscite campaign and interallied occupation was marked سے طرف کی violence. There were two Polish uprisings, and German volunteer paramilitary units came to the region as well. But the area was policed سے طرف کی French, British, and Italian troops, and overseen...