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When did Wilhelm II rule as German emperor and king of Prussia?

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Kaiser Wilhelm II of Germany in military uniform, wearing a fur hat with a prominent skull emblem and various medals and decorations on his chest. — Wilhelm II Wilhelm II, the last German emperor.

Wilhelm II served as the German emperor and king of Prussia from 1888 until 1918. His reign concluded at the end of World War I, when he was forced to abdicate on November 9, 1918, following Germany's defeat.12