The Independent Social Democratic Party of Germany, a short-lived political party in Germany during the German Empire and "Deutsches Reich", existed from 1919 to what year?
Independent Social Democratic Party of Germany: The Independent Social Democratic Party of Germany (German: "Unabhängige Sozialdemokratische Partei Deutschlands" , USPD) was a short-lived political party in Germany during the German Empire and the Weimar Republic. Weimar Republic: Weimar Republic (German: "Weimarer Republik" ] ) was an unofficial, historical designation for the German state between 1919 and 1933. Weimar Republic:  The official name of the state was "Deutsches Reich"; it had remained unchanged since 1871.
1933