Independent Social Democratic Party of Germany

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The Independent Social Democratic Party of Germany (German: Unabhängige Sozialdemokratische Partei Deutschlands, USPD) was a short-lived, left-wing political party in Germany during the late German Empire and early Weimar Republic. It was established in 1917 by members of the Social Democratic Party of Germany (SPD) who opposed Germany's involvement in World War I. After much of the USPD's membership joined the Communist Party of Germany (KPD) in 1920, the remainder returned to the SPD in 1922, with the exception of an insignificant faction that lasted until 1931. The Social Democratic Party officially supported Germany's entry into World War I in 1914, but a small number of members centering around Karl Liebknecht repeatedly voted against government requests for war bonds. The leadership of the SPD began expelling the opponents of the war in 1916, and in April 1917 a group of those who had been ousted formed the USPD. The new party, which included the far-left Spartacus League, agitated...

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